<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/Users/m018/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.31/src/offset/local/tz_info/rule.rs`."><title>rule.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../../../static.files/rustdoc-c4dbdcde0fbd8430.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../../../../static.files/light-db279b6232be9c13.css"><link rel="stylesheet" disabled href="../../../../../static.files/dark-cf923f49f397b216.css"><link rel="stylesheet" disabled href="../../../../../static.files/ayu-be46fdc453a55015.css"><script src="../../../../../static.files/storage-3891ce972e3a2bf8.js"></script><script defer src="../../../../../static.files/source-script-1b95b7cca98b26e5.js"></script><script defer src="../../../../../source-files.js"></script><script defer src="../../../../../static.files/main-98a684e84ae5b08b.js"></script><noscript><link rel="stylesheet" href="../../../../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../../../../chrono/index.html"><img class="rust-logo" src="../../../../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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<a href="#922" id="922">922</a>
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</pre><pre class="rust"><code><span class="kw">use </span>std::cmp::Ordering;
<span class="kw">use </span><span class="kw">super</span>::parser::Cursor;
<span class="kw">use </span><span class="kw">super</span>::timezone::{LocalTimeType, SECONDS_PER_WEEK};
<span class="kw">use super</span>::{
Error, CUMUL_DAY_IN_MONTHS_NORMAL_YEAR, DAYS_PER_WEEK, DAY_IN_MONTHS_NORMAL_YEAR,
SECONDS_PER_DAY,
};
<span class="doccomment">/// Transition rule
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>TransitionRule {
<span class="doccomment">/// Fixed local time type
</span>Fixed(LocalTimeType),
<span class="doccomment">/// Alternate local time types
</span>Alternate(AlternateTime),
}
<span class="kw">impl </span>TransitionRule {
<span class="doccomment">/// Parse a POSIX TZ string containing a time zone description, as described in [the POSIX documentation of the `TZ` environment variable](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html).
///
/// TZ string extensions from [RFC 8536](https://datatracker.ietf.org/doc/html/rfc8536#section-3.3.1) may be used.
///
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_tz_string(
tz_string: <span class="kw-2">&</span>[u8],
use_string_extensions: bool,
) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">let </span><span class="kw-2">mut </span>cursor = Cursor::new(tz_string);
<span class="kw">let </span>std_time_zone = <span class="prelude-val">Some</span>(parse_name(<span class="kw-2">&mut </span>cursor)<span class="question-mark">?</span>);
<span class="kw">let </span>std_offset = parse_offset(<span class="kw-2">&mut </span>cursor)<span class="question-mark">?</span>;
<span class="kw">if </span>cursor.is_empty() {
<span class="kw">return </span><span class="prelude-val">Ok</span>(LocalTimeType::new(-std_offset, <span class="bool-val">false</span>, std_time_zone)<span class="question-mark">?</span>.into());
}
<span class="kw">let </span>dst_time_zone = <span class="prelude-val">Some</span>(parse_name(<span class="kw-2">&mut </span>cursor)<span class="question-mark">?</span>);
<span class="kw">let </span>dst_offset = <span class="kw">match </span>cursor.peek() {
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b','</span>) => std_offset - <span class="number">3600</span>,
<span class="prelude-val">Some</span>(<span class="kw">_</span>) => parse_offset(<span class="kw-2">&mut </span>cursor)<span class="question-mark">?</span>,
<span class="prelude-val">None </span>=> {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnsupportedTzString(<span class="string">"DST start and end rules must be provided"</span>))
}
};
<span class="kw">if </span>cursor.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::UnsupportedTzString(<span class="string">"DST start and end rules must be provided"</span>));
}
cursor.read_tag(<span class="string">b","</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>(dst_start, dst_start_time) = RuleDay::parse(<span class="kw-2">&mut </span>cursor, use_string_extensions)<span class="question-mark">?</span>;
cursor.read_tag(<span class="string">b","</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>(dst_end, dst_end_time) = RuleDay::parse(<span class="kw-2">&mut </span>cursor, use_string_extensions)<span class="question-mark">?</span>;
<span class="kw">if </span>!cursor.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"remaining data after parsing TZ string"</span>));
}
<span class="prelude-val">Ok</span>(AlternateTime::new(
LocalTimeType::new(-std_offset, <span class="bool-val">false</span>, std_time_zone)<span class="question-mark">?</span>,
LocalTimeType::new(-dst_offset, <span class="bool-val">true</span>, dst_time_zone)<span class="question-mark">?</span>,
dst_start,
dst_start_time,
dst_end,
dst_end_time,
)<span class="question-mark">?
</span>.into())
}
<span class="doccomment">/// Find the local time type associated to the transition rule at the specified Unix time in seconds
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>find_local_time_type(<span class="kw-2">&</span><span class="self">self</span>, unix_time: i64) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span>LocalTimeType, Error> {
<span class="kw">match </span><span class="self">self </span>{
TransitionRule::Fixed(local_time_type) => <span class="prelude-val">Ok</span>(local_time_type),
TransitionRule::Alternate(alternate_time) => {
alternate_time.find_local_time_type(unix_time)
}
}
}
<span class="doccomment">/// Find the local time type associated to the transition rule at the specified Unix time in seconds
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>find_local_time_type_from_local(
<span class="kw-2">&</span><span class="self">self</span>,
local_time: i64,
year: i32,
) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::LocalResult<LocalTimeType>, Error> {
<span class="kw">match </span><span class="self">self </span>{
TransitionRule::Fixed(local_time_type) => {
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="kw-2">*</span>local_time_type))
}
TransitionRule::Alternate(alternate_time) => {
alternate_time.find_local_time_type_from_local(local_time, year)
}
}
}
}
<span class="kw">impl </span>From<LocalTimeType> <span class="kw">for </span>TransitionRule {
<span class="kw">fn </span>from(inner: LocalTimeType) -> <span class="self">Self </span>{
TransitionRule::Fixed(inner)
}
}
<span class="kw">impl </span>From<AlternateTime> <span class="kw">for </span>TransitionRule {
<span class="kw">fn </span>from(inner: AlternateTime) -> <span class="self">Self </span>{
TransitionRule::Alternate(inner)
}
}
<span class="doccomment">/// Transition rule representing alternate local time types
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>AlternateTime {
<span class="doccomment">/// Local time type for standard time
</span><span class="kw">pub</span>(<span class="kw">super</span>) std: LocalTimeType,
<span class="doccomment">/// Local time type for Daylight Saving Time
</span><span class="kw">pub</span>(<span class="kw">super</span>) dst: LocalTimeType,
<span class="doccomment">/// Start day of Daylight Saving Time
</span>dst_start: RuleDay,
<span class="doccomment">/// Local start day time of Daylight Saving Time, in seconds
</span>dst_start_time: i32,
<span class="doccomment">/// End day of Daylight Saving Time
</span>dst_end: RuleDay,
<span class="doccomment">/// Local end day time of Daylight Saving Time, in seconds
</span>dst_end_time: i32,
}
<span class="kw">impl </span>AlternateTime {
<span class="doccomment">/// Construct a transition rule representing alternate local time types
</span><span class="kw">const fn </span>new(
std: LocalTimeType,
dst: LocalTimeType,
dst_start: RuleDay,
dst_start_time: i32,
dst_end: RuleDay,
dst_end_time: i32,
) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="comment">// Overflow is not possible
</span><span class="kw">if </span>!((dst_start_time <span class="kw">as </span>i64).abs() < SECONDS_PER_WEEK
&& (dst_end_time <span class="kw">as </span>i64).abs() < SECONDS_PER_WEEK)
{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid DST start or end time"</span>));
}
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ std, dst, dst_start, dst_start_time, dst_end, dst_end_time })
}
<span class="doccomment">/// Find the local time type associated to the alternate transition rule at the specified Unix time in seconds
</span><span class="kw">fn </span>find_local_time_type(<span class="kw-2">&</span><span class="self">self</span>, unix_time: i64) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span>LocalTimeType, Error> {
<span class="comment">// Overflow is not possible
</span><span class="kw">let </span>dst_start_time_in_utc = <span class="self">self</span>.dst_start_time <span class="kw">as </span>i64 - <span class="self">self</span>.std.ut_offset <span class="kw">as </span>i64;
<span class="kw">let </span>dst_end_time_in_utc = <span class="self">self</span>.dst_end_time <span class="kw">as </span>i64 - <span class="self">self</span>.dst.ut_offset <span class="kw">as </span>i64;
<span class="kw">let </span>current_year = <span class="kw">match </span>UtcDateTime::from_timespec(unix_time) {
<span class="prelude-val">Ok</span>(dt) => dt.year,
<span class="prelude-val">Err</span>(error) => <span class="kw">return </span><span class="prelude-val">Err</span>(error),
};
<span class="comment">// Check if the current year is valid for the following computations
</span><span class="kw">if </span>!(i32::min_value() + <span class="number">2 </span><= current_year && current_year <= i32::max_value() - <span class="number">2</span>) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range date time"</span>));
}
<span class="kw">let </span>current_year_dst_start_unix_time =
<span class="self">self</span>.dst_start.unix_time(current_year, dst_start_time_in_utc);
<span class="kw">let </span>current_year_dst_end_unix_time =
<span class="self">self</span>.dst_end.unix_time(current_year, dst_end_time_in_utc);
<span class="comment">// Check DST start/end Unix times for previous/current/next years to support for transition day times outside of [0h, 24h] range
</span><span class="kw">let </span>is_dst =
<span class="kw">match </span>Ord::cmp(<span class="kw-2">&</span>current_year_dst_start_unix_time, <span class="kw-2">&</span>current_year_dst_end_unix_time) {
Ordering::Less | Ordering::Equal => {
<span class="kw">if </span>unix_time < current_year_dst_start_unix_time {
<span class="kw">let </span>previous_year_dst_end_unix_time =
<span class="self">self</span>.dst_end.unix_time(current_year - <span class="number">1</span>, dst_end_time_in_utc);
<span class="kw">if </span>unix_time < previous_year_dst_end_unix_time {
<span class="kw">let </span>previous_year_dst_start_unix_time =
<span class="self">self</span>.dst_start.unix_time(current_year - <span class="number">1</span>, dst_start_time_in_utc);
previous_year_dst_start_unix_time <= unix_time
} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
} <span class="kw">else if </span>unix_time < current_year_dst_end_unix_time {
<span class="bool-val">true
</span>} <span class="kw">else </span>{
<span class="kw">let </span>next_year_dst_start_unix_time =
<span class="self">self</span>.dst_start.unix_time(current_year + <span class="number">1</span>, dst_start_time_in_utc);
<span class="kw">if </span>next_year_dst_start_unix_time <= unix_time {
<span class="kw">let </span>next_year_dst_end_unix_time =
<span class="self">self</span>.dst_end.unix_time(current_year + <span class="number">1</span>, dst_end_time_in_utc);
unix_time < next_year_dst_end_unix_time
} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
}
}
Ordering::Greater => {
<span class="kw">if </span>unix_time < current_year_dst_end_unix_time {
<span class="kw">let </span>previous_year_dst_start_unix_time =
<span class="self">self</span>.dst_start.unix_time(current_year - <span class="number">1</span>, dst_start_time_in_utc);
<span class="kw">if </span>unix_time < previous_year_dst_start_unix_time {
<span class="kw">let </span>previous_year_dst_end_unix_time =
<span class="self">self</span>.dst_end.unix_time(current_year - <span class="number">1</span>, dst_end_time_in_utc);
unix_time < previous_year_dst_end_unix_time
} <span class="kw">else </span>{
<span class="bool-val">true
</span>}
} <span class="kw">else if </span>unix_time < current_year_dst_start_unix_time {
<span class="bool-val">false
</span>} <span class="kw">else </span>{
<span class="kw">let </span>next_year_dst_end_unix_time =
<span class="self">self</span>.dst_end.unix_time(current_year + <span class="number">1</span>, dst_end_time_in_utc);
<span class="kw">if </span>next_year_dst_end_unix_time <= unix_time {
<span class="kw">let </span>next_year_dst_start_unix_time =
<span class="self">self</span>.dst_start.unix_time(current_year + <span class="number">1</span>, dst_start_time_in_utc);
next_year_dst_start_unix_time <= unix_time
} <span class="kw">else </span>{
<span class="bool-val">true
</span>}
}
}
};
<span class="kw">if </span>is_dst {
<span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="self">self</span>.dst)
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="self">self</span>.std)
}
}
<span class="kw">fn </span>find_local_time_type_from_local(
<span class="kw-2">&</span><span class="self">self</span>,
local_time: i64,
current_year: i32,
) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::LocalResult<LocalTimeType>, Error> {
<span class="comment">// Check if the current year is valid for the following computations
</span><span class="kw">if </span>!(i32::min_value() + <span class="number">2 </span><= current_year && current_year <= i32::max_value() - <span class="number">2</span>) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range date time"</span>));
}
<span class="kw">let </span>dst_start_transition_start =
<span class="self">self</span>.dst_start.unix_time(current_year, <span class="number">0</span>) + i64::from(<span class="self">self</span>.dst_start_time);
<span class="kw">let </span>dst_start_transition_end = <span class="self">self</span>.dst_start.unix_time(current_year, <span class="number">0</span>)
+ i64::from(<span class="self">self</span>.dst_start_time)
+ i64::from(<span class="self">self</span>.dst.ut_offset)
- i64::from(<span class="self">self</span>.std.ut_offset);
<span class="kw">let </span>dst_end_transition_start =
<span class="self">self</span>.dst_end.unix_time(current_year, <span class="number">0</span>) + i64::from(<span class="self">self</span>.dst_end_time);
<span class="kw">let </span>dst_end_transition_end = <span class="self">self</span>.dst_end.unix_time(current_year, <span class="number">0</span>)
+ i64::from(<span class="self">self</span>.dst_end_time)
+ i64::from(<span class="self">self</span>.std.ut_offset)
- i64::from(<span class="self">self</span>.dst.ut_offset);
<span class="kw">match </span><span class="self">self</span>.std.ut_offset.cmp(<span class="kw-2">&</span><span class="self">self</span>.dst.ut_offset) {
Ordering::Equal => <span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std)),
Ordering::Less => {
<span class="kw">if </span><span class="self">self</span>.dst_start.transition_date(current_year).<span class="number">0
</span>< <span class="self">self</span>.dst_end.transition_date(current_year).<span class="number">0
</span>{
<span class="comment">// northern hemisphere
// For the DST END transition, the `start` happens at a later timestamp than the `end`.
</span><span class="kw">if </span>local_time <= dst_start_transition_start {
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
} <span class="kw">else if </span>local_time > dst_start_transition_start
&& local_time < dst_start_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::None)
} <span class="kw">else if </span>local_time >= dst_start_transition_end
&& local_time < dst_end_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
} <span class="kw">else if </span>local_time >= dst_end_transition_end
&& local_time <= dst_end_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(<span class="self">self</span>.std, <span class="self">self</span>.dst))
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
}
} <span class="kw">else </span>{
<span class="comment">// southern hemisphere regular DST
// For the DST END transition, the `start` happens at a later timestamp than the `end`.
</span><span class="kw">if </span>local_time < dst_end_transition_end {
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
} <span class="kw">else if </span>local_time >= dst_end_transition_end
&& local_time <= dst_end_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(<span class="self">self</span>.std, <span class="self">self</span>.dst))
} <span class="kw">else if </span>local_time > dst_end_transition_end
&& local_time < dst_start_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
} <span class="kw">else if </span>local_time >= dst_start_transition_start
&& local_time < dst_start_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::None)
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
}
}
}
Ordering::Greater => {
<span class="kw">if </span><span class="self">self</span>.dst_start.transition_date(current_year).<span class="number">0
</span>< <span class="self">self</span>.dst_end.transition_date(current_year).<span class="number">0
</span>{
<span class="comment">// southern hemisphere reverse DST
// For the DST END transition, the `start` happens at a later timestamp than the `end`.
</span><span class="kw">if </span>local_time < dst_start_transition_end {
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
} <span class="kw">else if </span>local_time >= dst_start_transition_end
&& local_time <= dst_start_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(<span class="self">self</span>.dst, <span class="self">self</span>.std))
} <span class="kw">else if </span>local_time > dst_start_transition_start
&& local_time < dst_end_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
} <span class="kw">else if </span>local_time >= dst_end_transition_start
&& local_time < dst_end_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::None)
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
}
} <span class="kw">else </span>{
<span class="comment">// northern hemisphere reverse DST
// For the DST END transition, the `start` happens at a later timestamp than the `end`.
</span><span class="kw">if </span>local_time <= dst_end_transition_start {
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
} <span class="kw">else if </span>local_time > dst_end_transition_start
&& local_time < dst_end_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::None)
} <span class="kw">else if </span>local_time >= dst_end_transition_end
&& local_time < dst_start_transition_end
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.std))
} <span class="kw">else if </span>local_time >= dst_start_transition_end
&& local_time <= dst_start_transition_start
{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(<span class="self">self</span>.dst, <span class="self">self</span>.std))
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(<span class="self">self</span>.dst))
}
}
}
}
}
}
<span class="doccomment">/// Parse time zone name
</span><span class="kw">fn </span>parse_name<<span class="lifetime">'a</span>>(cursor: <span class="kw-2">&mut </span>Cursor<<span class="lifetime">'a</span>>) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], Error> {
<span class="kw">match </span>cursor.peek() {
<span class="prelude-val">Some</span>(<span class="string">b'<'</span>) => {}
<span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(cursor.read_while(u8::is_ascii_alphabetic)<span class="question-mark">?</span>),
}
cursor.read_exact(<span class="number">1</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>unquoted = cursor.read_until(|<span class="kw-2">&</span>x| x == <span class="string">b'>'</span>)<span class="question-mark">?</span>;
cursor.read_exact(<span class="number">1</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(unquoted)
}
<span class="doccomment">/// Parse time zone offset
</span><span class="kw">fn </span>parse_offset(cursor: <span class="kw-2">&mut </span>Cursor) -> <span class="prelude-ty">Result</span><i32, Error> {
<span class="kw">let </span>(sign, hour, minute, second) = parse_signed_hhmmss(cursor)<span class="question-mark">?</span>;
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">24</span>).contains(<span class="kw-2">&</span>hour) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid offset hour"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>minute) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid offset minute"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>second) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid offset second"</span>));
}
<span class="prelude-val">Ok</span>(sign * (hour * <span class="number">3600 </span>+ minute * <span class="number">60 </span>+ second))
}
<span class="doccomment">/// Parse transition rule time
</span><span class="kw">fn </span>parse_rule_time(cursor: <span class="kw-2">&mut </span>Cursor) -> <span class="prelude-ty">Result</span><i32, Error> {
<span class="kw">let </span>(hour, minute, second) = parse_hhmmss(cursor)<span class="question-mark">?</span>;
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">24</span>).contains(<span class="kw-2">&</span>hour) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time hour"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>minute) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time minute"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>second) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time second"</span>));
}
<span class="prelude-val">Ok</span>(hour * <span class="number">3600 </span>+ minute * <span class="number">60 </span>+ second)
}
<span class="doccomment">/// Parse transition rule time with TZ string extensions
</span><span class="kw">fn </span>parse_rule_time_extended(cursor: <span class="kw-2">&mut </span>Cursor) -> <span class="prelude-ty">Result</span><i32, Error> {
<span class="kw">let </span>(sign, hour, minute, second) = parse_signed_hhmmss(cursor)<span class="question-mark">?</span>;
<span class="kw">if </span>!(-<span class="number">167</span>..=<span class="number">167</span>).contains(<span class="kw-2">&</span>hour) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time hour"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>minute) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time minute"</span>));
}
<span class="kw">if </span>!(<span class="number">0</span>..=<span class="number">59</span>).contains(<span class="kw-2">&</span>second) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"invalid day time second"</span>));
}
<span class="prelude-val">Ok</span>(sign * (hour * <span class="number">3600 </span>+ minute * <span class="number">60 </span>+ second))
}
<span class="doccomment">/// Parse hours, minutes and seconds
</span><span class="kw">fn </span>parse_hhmmss(cursor: <span class="kw-2">&mut </span>Cursor) -> <span class="prelude-ty">Result</span><(i32, i32, i32), Error> {
<span class="kw">let </span>hour = cursor.read_int()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>minute = <span class="number">0</span>;
<span class="kw">let </span><span class="kw-2">mut </span>second = <span class="number">0</span>;
<span class="kw">if </span>cursor.read_optional_tag(<span class="string">b":"</span>)<span class="question-mark">? </span>{
minute = cursor.read_int()<span class="question-mark">?</span>;
<span class="kw">if </span>cursor.read_optional_tag(<span class="string">b":"</span>)<span class="question-mark">? </span>{
second = cursor.read_int()<span class="question-mark">?</span>;
}
}
<span class="prelude-val">Ok</span>((hour, minute, second))
}
<span class="doccomment">/// Parse signed hours, minutes and seconds
</span><span class="kw">fn </span>parse_signed_hhmmss(cursor: <span class="kw-2">&mut </span>Cursor) -> <span class="prelude-ty">Result</span><(i32, i32, i32, i32), Error> {
<span class="kw">let </span><span class="kw-2">mut </span>sign = <span class="number">1</span>;
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>c) = cursor.peek() {
<span class="kw">if </span>c == <span class="string">b'+' </span>|| c == <span class="string">b'-' </span>{
cursor.read_exact(<span class="number">1</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>c == <span class="string">b'-' </span>{
sign = -<span class="number">1</span>;
}
}
}
<span class="kw">let </span>(hour, minute, second) = parse_hhmmss(cursor)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>((sign, hour, minute, second))
}
<span class="doccomment">/// Transition rule day
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">enum </span>RuleDay {
<span class="doccomment">/// Julian day in `[1, 365]`, without taking occasional Feb 29 into account, which is not referenceable
</span>Julian1WithoutLeap(u16),
<span class="doccomment">/// Zero-based Julian day in `[0, 365]`, taking occasional Feb 29 into account
</span>Julian0WithLeap(u16),
<span class="doccomment">/// Day represented by a month, a month week and a week day
</span>MonthWeekday {
<span class="doccomment">/// Month in `[1, 12]`
</span>month: u8,
<span class="doccomment">/// Week of the month in `[1, 5]`, with `5` representing the last week of the month
</span>week: u8,
<span class="doccomment">/// Day of the week in `[0, 6]` from Sunday
</span>week_day: u8,
},
}
<span class="kw">impl </span>RuleDay {
<span class="doccomment">/// Parse transition rule
</span><span class="kw">fn </span>parse(cursor: <span class="kw-2">&mut </span>Cursor, use_string_extensions: bool) -> <span class="prelude-ty">Result</span><(<span class="self">Self</span>, i32), Error> {
<span class="kw">let </span>date = <span class="kw">match </span>cursor.peek() {
<span class="prelude-val">Some</span>(<span class="string">b'M'</span>) => {
cursor.read_exact(<span class="number">1</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>month = cursor.read_int()<span class="question-mark">?</span>;
cursor.read_tag(<span class="string">b"."</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>week = cursor.read_int()<span class="question-mark">?</span>;
cursor.read_tag(<span class="string">b"."</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>week_day = cursor.read_int()<span class="question-mark">?</span>;
RuleDay::month_weekday(month, week, week_day)<span class="question-mark">?
</span>}
<span class="prelude-val">Some</span>(<span class="string">b'J'</span>) => {
cursor.read_exact(<span class="number">1</span>)<span class="question-mark">?</span>;
RuleDay::julian_1(cursor.read_int()<span class="question-mark">?</span>)<span class="question-mark">?
</span>}
<span class="kw">_ </span>=> RuleDay::julian_0(cursor.read_int()<span class="question-mark">?</span>)<span class="question-mark">?</span>,
};
<span class="prelude-val">Ok</span>((
date,
<span class="kw">match </span>(cursor.read_optional_tag(<span class="string">b"/"</span>)<span class="question-mark">?</span>, use_string_extensions) {
(<span class="bool-val">false</span>, <span class="kw">_</span>) => <span class="number">2 </span>* <span class="number">3600</span>,
(<span class="bool-val">true</span>, <span class="bool-val">true</span>) => parse_rule_time_extended(cursor)<span class="question-mark">?</span>,
(<span class="bool-val">true</span>, <span class="bool-val">false</span>) => parse_rule_time(cursor)<span class="question-mark">?</span>,
},
))
}
<span class="doccomment">/// Construct a transition rule day represented by a Julian day in `[1, 365]`, without taking occasional Feb 29 into account, which is not referenceable
</span><span class="kw">fn </span>julian_1(julian_day_1: u16) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>!(<span class="number">1</span>..=<span class="number">365</span>).contains(<span class="kw-2">&</span>julian_day_1) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid rule day julian day"</span>));
}
<span class="prelude-val">Ok</span>(RuleDay::Julian1WithoutLeap(julian_day_1))
}
<span class="doccomment">/// Construct a transition rule day represented by a zero-based Julian day in `[0, 365]`, taking occasional Feb 29 into account
</span><span class="kw">const fn </span>julian_0(julian_day_0: u16) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>julian_day_0 > <span class="number">365 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid rule day julian day"</span>));
}
<span class="prelude-val">Ok</span>(RuleDay::Julian0WithLeap(julian_day_0))
}
<span class="doccomment">/// Construct a transition rule day represented by a month, a month week and a week day
</span><span class="kw">fn </span>month_weekday(month: u8, week: u8, week_day: u8) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>!(<span class="number">1</span>..=<span class="number">12</span>).contains(<span class="kw-2">&</span>month) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid rule day month"</span>));
}
<span class="kw">if </span>!(<span class="number">1</span>..=<span class="number">5</span>).contains(<span class="kw-2">&</span>week) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid rule day week"</span>));
}
<span class="kw">if </span>week_day > <span class="number">6 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TransitionRule(<span class="string">"invalid rule day week day"</span>));
}
<span class="prelude-val">Ok</span>(RuleDay::MonthWeekday { month, week, week_day })
}
<span class="doccomment">/// Get the transition date for the provided year
///
/// ## Outputs
///
/// * `month`: Month in `[1, 12]`
/// * `month_day`: Day of the month in `[1, 31]`
</span><span class="kw">fn </span>transition_date(<span class="kw-2">&</span><span class="self">self</span>, year: i32) -> (usize, i64) {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
RuleDay::Julian1WithoutLeap(year_day) => {
<span class="kw">let </span>year_day = year_day <span class="kw">as </span>i64;
<span class="kw">let </span>month = <span class="kw">match </span>CUMUL_DAY_IN_MONTHS_NORMAL_YEAR.binary_search(<span class="kw-2">&</span>(year_day - <span class="number">1</span>)) {
<span class="prelude-val">Ok</span>(x) => x + <span class="number">1</span>,
<span class="prelude-val">Err</span>(x) => x,
};
<span class="kw">let </span>month_day = year_day - CUMUL_DAY_IN_MONTHS_NORMAL_YEAR[month - <span class="number">1</span>];
(month, month_day)
}
RuleDay::Julian0WithLeap(year_day) => {
<span class="kw">let </span>leap = is_leap_year(year) <span class="kw">as </span>i64;
<span class="kw">let </span>cumul_day_in_months = [
<span class="number">0</span>,
<span class="number">31</span>,
<span class="number">59 </span>+ leap,
<span class="number">90 </span>+ leap,
<span class="number">120 </span>+ leap,
<span class="number">151 </span>+ leap,
<span class="number">181 </span>+ leap,
<span class="number">212 </span>+ leap,
<span class="number">243 </span>+ leap,
<span class="number">273 </span>+ leap,
<span class="number">304 </span>+ leap,
<span class="number">334 </span>+ leap,
];
<span class="kw">let </span>year_day = year_day <span class="kw">as </span>i64;
<span class="kw">let </span>month = <span class="kw">match </span>cumul_day_in_months.binary_search(<span class="kw-2">&</span>year_day) {
<span class="prelude-val">Ok</span>(x) => x + <span class="number">1</span>,
<span class="prelude-val">Err</span>(x) => x,
};
<span class="kw">let </span>month_day = <span class="number">1 </span>+ year_day - cumul_day_in_months[month - <span class="number">1</span>];
(month, month_day)
}
RuleDay::MonthWeekday { month: rule_month, week, week_day } => {
<span class="kw">let </span>leap = is_leap_year(year) <span class="kw">as </span>i64;
<span class="kw">let </span>month = rule_month <span class="kw">as </span>usize;
<span class="kw">let </span><span class="kw-2">mut </span>day_in_month = DAY_IN_MONTHS_NORMAL_YEAR[month - <span class="number">1</span>];
<span class="kw">if </span>month == <span class="number">2 </span>{
day_in_month += leap;
}
<span class="kw">let </span>week_day_of_first_month_day =
(<span class="number">4 </span>+ days_since_unix_epoch(year, month, <span class="number">1</span>)).rem_euclid(DAYS_PER_WEEK);
<span class="kw">let </span>first_week_day_occurence_in_month =
<span class="number">1 </span>+ (week_day <span class="kw">as </span>i64 - week_day_of_first_month_day).rem_euclid(DAYS_PER_WEEK);
<span class="kw">let </span><span class="kw-2">mut </span>month_day =
first_week_day_occurence_in_month + (week <span class="kw">as </span>i64 - <span class="number">1</span>) * DAYS_PER_WEEK;
<span class="kw">if </span>month_day > day_in_month {
month_day -= DAYS_PER_WEEK
}
(month, month_day)
}
}
}
<span class="doccomment">/// Returns the UTC Unix time in seconds associated to the transition date for the provided year
</span><span class="kw">fn </span>unix_time(<span class="kw-2">&</span><span class="self">self</span>, year: i32, day_time_in_utc: i64) -> i64 {
<span class="kw">let </span>(month, month_day) = <span class="self">self</span>.transition_date(year);
days_since_unix_epoch(year, month, month_day) * SECONDS_PER_DAY + day_time_in_utc
}
}
<span class="doccomment">/// UTC date time exprimed in the [proleptic gregorian calendar](https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar)
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>UtcDateTime {
<span class="doccomment">/// Year
</span><span class="kw">pub</span>(<span class="kw">crate</span>) year: i32,
<span class="doccomment">/// Month in `[1, 12]`
</span><span class="kw">pub</span>(<span class="kw">crate</span>) month: u8,
<span class="doccomment">/// Day of the month in `[1, 31]`
</span><span class="kw">pub</span>(<span class="kw">crate</span>) month_day: u8,
<span class="doccomment">/// Hours since midnight in `[0, 23]`
</span><span class="kw">pub</span>(<span class="kw">crate</span>) hour: u8,
<span class="doccomment">/// Minutes in `[0, 59]`
</span><span class="kw">pub</span>(<span class="kw">crate</span>) minute: u8,
<span class="doccomment">/// Seconds in `[0, 60]`, with a possible leap second
</span><span class="kw">pub</span>(<span class="kw">crate</span>) second: u8,
}
<span class="kw">impl </span>UtcDateTime {
<span class="doccomment">/// Construct a UTC date time from a Unix time in seconds and nanoseconds
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_timespec(unix_time: i64) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">let </span>seconds = <span class="kw">match </span>unix_time.checked_sub(UNIX_OFFSET_SECS) {
<span class="prelude-val">Some</span>(seconds) => seconds,
<span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range operation"</span>)),
};
<span class="kw">let </span><span class="kw-2">mut </span>remaining_days = seconds / SECONDS_PER_DAY;
<span class="kw">let </span><span class="kw-2">mut </span>remaining_seconds = seconds % SECONDS_PER_DAY;
<span class="kw">if </span>remaining_seconds < <span class="number">0 </span>{
remaining_seconds += SECONDS_PER_DAY;
remaining_days -= <span class="number">1</span>;
}
<span class="kw">let </span><span class="kw-2">mut </span>cycles_400_years = remaining_days / DAYS_PER_400_YEARS;
remaining_days %= DAYS_PER_400_YEARS;
<span class="kw">if </span>remaining_days < <span class="number">0 </span>{
remaining_days += DAYS_PER_400_YEARS;
cycles_400_years -= <span class="number">1</span>;
}
<span class="kw">let </span>cycles_100_years = Ord::min(remaining_days / DAYS_PER_100_YEARS, <span class="number">3</span>);
remaining_days -= cycles_100_years * DAYS_PER_100_YEARS;
<span class="kw">let </span>cycles_4_years = Ord::min(remaining_days / DAYS_PER_4_YEARS, <span class="number">24</span>);
remaining_days -= cycles_4_years * DAYS_PER_4_YEARS;
<span class="kw">let </span>remaining_years = Ord::min(remaining_days / DAYS_PER_NORMAL_YEAR, <span class="number">3</span>);
remaining_days -= remaining_years * DAYS_PER_NORMAL_YEAR;
<span class="kw">let </span><span class="kw-2">mut </span>year = OFFSET_YEAR
+ remaining_years
+ cycles_4_years * <span class="number">4
</span>+ cycles_100_years * <span class="number">100
</span>+ cycles_400_years * <span class="number">400</span>;
<span class="kw">let </span><span class="kw-2">mut </span>month = <span class="number">0</span>;
<span class="kw">while </span>month < DAY_IN_MONTHS_LEAP_YEAR_FROM_MARCH.len() {
<span class="kw">let </span>days = DAY_IN_MONTHS_LEAP_YEAR_FROM_MARCH[month];
<span class="kw">if </span>remaining_days < days {
<span class="kw">break</span>;
}
remaining_days -= days;
month += <span class="number">1</span>;
}
month += <span class="number">2</span>;
<span class="kw">if </span>month >= MONTHS_PER_YEAR <span class="kw">as </span>usize {
month -= MONTHS_PER_YEAR <span class="kw">as </span>usize;
year += <span class="number">1</span>;
}
month += <span class="number">1</span>;
<span class="kw">let </span>month_day = <span class="number">1 </span>+ remaining_days;
<span class="kw">let </span>hour = remaining_seconds / SECONDS_PER_HOUR;
<span class="kw">let </span>minute = (remaining_seconds / SECONDS_PER_MINUTE) % MINUTES_PER_HOUR;
<span class="kw">let </span>second = remaining_seconds % SECONDS_PER_MINUTE;
<span class="kw">let </span>year = <span class="kw">match </span>year >= i32::min_value() <span class="kw">as </span>i64 && year <= i32::max_value() <span class="kw">as </span>i64 {
<span class="bool-val">true </span>=> year <span class="kw">as </span>i32,
<span class="bool-val">false </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"i64 is out of range for i32"</span>)),
};
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{
year,
month: month <span class="kw">as </span>u8,
month_day: month_day <span class="kw">as </span>u8,
hour: hour <span class="kw">as </span>u8,
minute: minute <span class="kw">as </span>u8,
second: second <span class="kw">as </span>u8,
})
}
}
<span class="doccomment">/// Number of nanoseconds in one second
</span><span class="kw">const </span>NANOSECONDS_PER_SECOND: u32 = <span class="number">1_000_000_000</span>;
<span class="doccomment">/// Number of seconds in one minute
</span><span class="kw">const </span>SECONDS_PER_MINUTE: i64 = <span class="number">60</span>;
<span class="doccomment">/// Number of seconds in one hour
</span><span class="kw">const </span>SECONDS_PER_HOUR: i64 = <span class="number">3600</span>;
<span class="doccomment">/// Number of minutes in one hour
</span><span class="kw">const </span>MINUTES_PER_HOUR: i64 = <span class="number">60</span>;
<span class="doccomment">/// Number of months in one year
</span><span class="kw">const </span>MONTHS_PER_YEAR: i64 = <span class="number">12</span>;
<span class="doccomment">/// Number of days in a normal year
</span><span class="kw">const </span>DAYS_PER_NORMAL_YEAR: i64 = <span class="number">365</span>;
<span class="doccomment">/// Number of days in 4 years (including 1 leap year)
</span><span class="kw">const </span>DAYS_PER_4_YEARS: i64 = DAYS_PER_NORMAL_YEAR * <span class="number">4 </span>+ <span class="number">1</span>;
<span class="doccomment">/// Number of days in 100 years (including 24 leap years)
</span><span class="kw">const </span>DAYS_PER_100_YEARS: i64 = DAYS_PER_NORMAL_YEAR * <span class="number">100 </span>+ <span class="number">24</span>;
<span class="doccomment">/// Number of days in 400 years (including 97 leap years)
</span><span class="kw">const </span>DAYS_PER_400_YEARS: i64 = DAYS_PER_NORMAL_YEAR * <span class="number">400 </span>+ <span class="number">97</span>;
<span class="doccomment">/// Unix time at `2000-03-01T00:00:00Z` (Wednesday)
</span><span class="kw">const </span>UNIX_OFFSET_SECS: i64 = <span class="number">951868800</span>;
<span class="doccomment">/// Offset year
</span><span class="kw">const </span>OFFSET_YEAR: i64 = <span class="number">2000</span>;
<span class="doccomment">/// Month days in a leap year from March
</span><span class="kw">const </span>DAY_IN_MONTHS_LEAP_YEAR_FROM_MARCH: [i64; <span class="number">12</span>] =
[<span class="number">31</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">31</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">31</span>, <span class="number">29</span>];
<span class="doccomment">/// Compute the number of days since Unix epoch (`1970-01-01T00:00:00Z`).
///
/// ## Inputs
///
/// * `year`: Year
/// * `month`: Month in `[1, 12]`
/// * `month_day`: Day of the month in `[1, 31]`
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>days_since_unix_epoch(year: i32, month: usize, month_day: i64) -> i64 {
<span class="kw">let </span>is_leap_year = is_leap_year(year);
<span class="kw">let </span>year = year <span class="kw">as </span>i64;
<span class="kw">let </span><span class="kw-2">mut </span>result = (year - <span class="number">1970</span>) * <span class="number">365</span>;
<span class="kw">if </span>year >= <span class="number">1970 </span>{
result += (year - <span class="number">1968</span>) / <span class="number">4</span>;
result -= (year - <span class="number">1900</span>) / <span class="number">100</span>;
result += (year - <span class="number">1600</span>) / <span class="number">400</span>;
<span class="kw">if </span>is_leap_year && month < <span class="number">3 </span>{
result -= <span class="number">1</span>;
}
} <span class="kw">else </span>{
result += (year - <span class="number">1972</span>) / <span class="number">4</span>;
result -= (year - <span class="number">2000</span>) / <span class="number">100</span>;
result += (year - <span class="number">2000</span>) / <span class="number">400</span>;
<span class="kw">if </span>is_leap_year && month >= <span class="number">3 </span>{
result += <span class="number">1</span>;
}
}
result += CUMUL_DAY_IN_MONTHS_NORMAL_YEAR[month - <span class="number">1</span>] + month_day - <span class="number">1</span>;
result
}
<span class="doccomment">/// Check if a year is a leap year
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>is_leap_year(year: i32) -> bool {
year % <span class="number">400 </span>== <span class="number">0 </span>|| (year % <span class="number">4 </span>== <span class="number">0 </span>&& year % <span class="number">100 </span>!= <span class="number">0</span>)
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::timezone::Transition;
<span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::{Error, TimeZone};
<span class="kw">use super</span>::{AlternateTime, LocalTimeType, RuleDay, TransitionRule};
<span class="attr">#[test]
</span><span class="kw">fn </span>test_quoted() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>transition_rule = TransitionRule::from_tz_string(<span class="string">b"<-03>+3<+03>-3,J1,J365"</span>, <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(
transition_rule,
AlternateTime::new(
LocalTimeType::new(-<span class="number">10800</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"-03"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">10800</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"+03"</span>))<span class="question-mark">?</span>,
RuleDay::julian_1(<span class="number">1</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
RuleDay::julian_1(<span class="number">365</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
)<span class="question-mark">?
</span>.into()
);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_full() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>tz_string = <span class="string">b"NZST-12:00:00NZDT-13:00:00,M10.1.0/02:00:00,M3.3.0/02:00:00"</span>;
<span class="kw">let </span>transition_rule = TransitionRule::from_tz_string(tz_string, <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(
transition_rule,
AlternateTime::new(
LocalTimeType::new(<span class="number">43200</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"NZST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">46800</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"NZDT"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">1</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">3</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
)<span class="question-mark">?
</span>.into()
);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_negative_dst() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>tz_string = <span class="string">b"IST-1GMT0,M10.5.0,M3.5.0/1"</span>;
<span class="kw">let </span>transition_rule = TransitionRule::from_tz_string(tz_string, <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(
transition_rule,
AlternateTime::new(
LocalTimeType::new(<span class="number">3600</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"IST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"GMT"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">3600</span>,
)<span class="question-mark">?
</span>.into()
);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_negative_hour() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>tz_string = <span class="string">b"<-03>3<-02>,M3.5.0/-2,M10.5.0/-1"</span>;
<span class="macro">assert!</span>(TransitionRule::from_tz_string(tz_string, <span class="bool-val">false</span>).is_err());
<span class="macro">assert_eq!</span>(
TransitionRule::from_tz_string(tz_string, <span class="bool-val">true</span>)<span class="question-mark">?</span>,
AlternateTime::new(
LocalTimeType::new(-<span class="number">10800</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"-03"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">7200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"-02"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
-<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
-<span class="number">3600</span>,
)<span class="question-mark">?
</span>.into()
);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_all_year_dst() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>tz_string = <span class="string">b"EST5EDT,0/0,J365/25"</span>;
<span class="macro">assert!</span>(TransitionRule::from_tz_string(tz_string, <span class="bool-val">false</span>).is_err());
<span class="macro">assert_eq!</span>(
TransitionRule::from_tz_string(tz_string, <span class="bool-val">true</span>)<span class="question-mark">?</span>,
AlternateTime::new(
LocalTimeType::new(-<span class="number">18000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"EST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">14400</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"EDT"</span>))<span class="question-mark">?</span>,
RuleDay::julian_0(<span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
RuleDay::julian_1(<span class="number">365</span>)<span class="question-mark">?</span>,
<span class="number">90000</span>,
)<span class="question-mark">?
</span>.into()
);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_v3_file() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>bytes = <span class="string">b"TZif3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\x04\0\0\x1c\x20\0\0IST\0TZif3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\x01\0\0\0\0\0\0\0\x01\0\0\0\x01\0\0\0\x04\0\0\0\0\x7f\xe8\x17\x80\0\0\0\x1c\x20\0\0IST\0\x01\x01\x0aIST-2IDT,M3.4.4/26,M10.5.0\x0a"</span>;
<span class="kw">let </span>time_zone = TimeZone::from_tz_data(bytes)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_result = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(<span class="number">2145916800</span>, <span class="number">0</span>)],
<span class="macro">vec!</span>[LocalTimeType::new(<span class="number">7200</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"IST"</span>))<span class="question-mark">?</span>],
Vec::new(),
<span class="prelude-val">Some</span>(TransitionRule::from(AlternateTime::new(
LocalTimeType::new(<span class="number">7200</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"IST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">10800</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"IDT"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">4</span>, <span class="number">4</span>)<span class="question-mark">?</span>,
<span class="number">93600</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
)<span class="question-mark">?</span>)),
)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(time_zone, time_zone_result);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_rule_day() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>rule_day_j1 = RuleDay::julian_1(<span class="number">60</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(rule_day_j1.transition_date(<span class="number">2000</span>), (<span class="number">3</span>, <span class="number">1</span>));
<span class="macro">assert_eq!</span>(rule_day_j1.transition_date(<span class="number">2001</span>), (<span class="number">3</span>, <span class="number">1</span>));
<span class="macro">assert_eq!</span>(rule_day_j1.unix_time(<span class="number">2000</span>, <span class="number">43200</span>), <span class="number">951912000</span>);
<span class="kw">let </span>rule_day_j0 = RuleDay::julian_0(<span class="number">59</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(rule_day_j0.transition_date(<span class="number">2000</span>), (<span class="number">2</span>, <span class="number">29</span>));
<span class="macro">assert_eq!</span>(rule_day_j0.transition_date(<span class="number">2001</span>), (<span class="number">3</span>, <span class="number">1</span>));
<span class="macro">assert_eq!</span>(rule_day_j0.unix_time(<span class="number">2000</span>, <span class="number">43200</span>), <span class="number">951825600</span>);
<span class="kw">let </span>rule_day_mwd = RuleDay::month_weekday(<span class="number">2</span>, <span class="number">5</span>, <span class="number">2</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(rule_day_mwd.transition_date(<span class="number">2000</span>), (<span class="number">2</span>, <span class="number">29</span>));
<span class="macro">assert_eq!</span>(rule_day_mwd.transition_date(<span class="number">2001</span>), (<span class="number">2</span>, <span class="number">27</span>));
<span class="macro">assert_eq!</span>(rule_day_mwd.unix_time(<span class="number">2000</span>, <span class="number">43200</span>), <span class="number">951825600</span>);
<span class="macro">assert_eq!</span>(rule_day_mwd.unix_time(<span class="number">2001</span>, <span class="number">43200</span>), <span class="number">983275200</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_transition_rule() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>transition_rule_fixed = TransitionRule::from(LocalTimeType::new(-<span class="number">36000</span>, <span class="bool-val">false</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>);
<span class="macro">assert_eq!</span>(transition_rule_fixed.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>.offset(), -<span class="number">36000</span>);
<span class="kw">let </span>transition_rule_dst = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(<span class="number">43200</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"NZST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">46800</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"NZDT"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">1</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">3</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
)<span class="question-mark">?</span>);
<span class="macro">assert_eq!</span>(transition_rule_dst.find_local_time_type(<span class="number">953384399</span>)<span class="question-mark">?</span>.offset(), <span class="number">46800</span>);
<span class="macro">assert_eq!</span>(transition_rule_dst.find_local_time_type(<span class="number">953384400</span>)<span class="question-mark">?</span>.offset(), <span class="number">43200</span>);
<span class="macro">assert_eq!</span>(transition_rule_dst.find_local_time_type(<span class="number">970322399</span>)<span class="question-mark">?</span>.offset(), <span class="number">43200</span>);
<span class="macro">assert_eq!</span>(transition_rule_dst.find_local_time_type(<span class="number">970322400</span>)<span class="question-mark">?</span>.offset(), <span class="number">46800</span>);
<span class="kw">let </span>transition_rule_negative_dst = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(<span class="number">3600</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"IST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"GMT"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">3600</span>,
)<span class="question-mark">?</span>);
<span class="macro">assert_eq!</span>(transition_rule_negative_dst.find_local_time_type(<span class="number">954032399</span>)<span class="question-mark">?</span>.offset(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(transition_rule_negative_dst.find_local_time_type(<span class="number">954032400</span>)<span class="question-mark">?</span>.offset(), <span class="number">3600</span>);
<span class="macro">assert_eq!</span>(transition_rule_negative_dst.find_local_time_type(<span class="number">972781199</span>)<span class="question-mark">?</span>.offset(), <span class="number">3600</span>);
<span class="macro">assert_eq!</span>(transition_rule_negative_dst.find_local_time_type(<span class="number">972781200</span>)<span class="question-mark">?</span>.offset(), <span class="number">0</span>);
<span class="kw">let </span>transition_rule_negative_time_1 = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">false</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">true</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
RuleDay::julian_0(<span class="number">100</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
RuleDay::julian_0(<span class="number">101</span>)<span class="question-mark">?</span>,
-<span class="number">86500</span>,
)<span class="question-mark">?</span>);
<span class="macro">assert!</span>(transition_rule_negative_time_1.find_local_time_type(<span class="number">8639899</span>)<span class="question-mark">?</span>.is_dst());
<span class="macro">assert!</span>(!transition_rule_negative_time_1.find_local_time_type(<span class="number">8639900</span>)<span class="question-mark">?</span>.is_dst());
<span class="macro">assert!</span>(!transition_rule_negative_time_1.find_local_time_type(<span class="number">8639999</span>)<span class="question-mark">?</span>.is_dst());
<span class="macro">assert!</span>(transition_rule_negative_time_1.find_local_time_type(<span class="number">8640000</span>)<span class="question-mark">?</span>.is_dst());
<span class="kw">let </span>transition_rule_negative_time_2 = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(-<span class="number">10800</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"-03"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">7200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"-02"</span>))<span class="question-mark">?</span>,
RuleDay::month_weekday(<span class="number">3</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
-<span class="number">7200</span>,
RuleDay::month_weekday(<span class="number">10</span>, <span class="number">5</span>, <span class="number">0</span>)<span class="question-mark">?</span>,
-<span class="number">3600</span>,
)<span class="question-mark">?</span>);
<span class="macro">assert_eq!</span>(
transition_rule_negative_time_2.find_local_time_type(<span class="number">954032399</span>)<span class="question-mark">?</span>.offset(),
-<span class="number">10800
</span>);
<span class="macro">assert_eq!</span>(
transition_rule_negative_time_2.find_local_time_type(<span class="number">954032400</span>)<span class="question-mark">?</span>.offset(),
-<span class="number">7200
</span>);
<span class="macro">assert_eq!</span>(
transition_rule_negative_time_2.find_local_time_type(<span class="number">972781199</span>)<span class="question-mark">?</span>.offset(),
-<span class="number">7200
</span>);
<span class="macro">assert_eq!</span>(
transition_rule_negative_time_2.find_local_time_type(<span class="number">972781200</span>)<span class="question-mark">?</span>.offset(),
-<span class="number">10800
</span>);
<span class="kw">let </span>transition_rule_all_year_dst = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(-<span class="number">18000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"EST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">14400</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"EDT"</span>))<span class="question-mark">?</span>,
RuleDay::julian_0(<span class="number">0</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
RuleDay::julian_1(<span class="number">365</span>)<span class="question-mark">?</span>,
<span class="number">90000</span>,
)<span class="question-mark">?</span>);
<span class="macro">assert_eq!</span>(transition_rule_all_year_dst.find_local_time_type(<span class="number">946702799</span>)<span class="question-mark">?</span>.offset(), -<span class="number">14400</span>);
<span class="macro">assert_eq!</span>(transition_rule_all_year_dst.find_local_time_type(<span class="number">946702800</span>)<span class="question-mark">?</span>.offset(), -<span class="number">14400</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_transition_rule_overflow() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>transition_rule_1 = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(-<span class="number">1</span>, <span class="bool-val">false</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">1</span>, <span class="bool-val">true</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
RuleDay::julian_1(<span class="number">365</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
RuleDay::julian_1(<span class="number">1</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
)<span class="question-mark">?</span>);
<span class="kw">let </span>transition_rule_2 = TransitionRule::from(AlternateTime::new(
LocalTimeType::new(<span class="number">1</span>, <span class="bool-val">false</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
LocalTimeType::new(<span class="number">1</span>, <span class="bool-val">true</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>,
RuleDay::julian_1(<span class="number">365</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
RuleDay::julian_1(<span class="number">1</span>)<span class="question-mark">?</span>,
<span class="number">0</span>,
)<span class="question-mark">?</span>);
<span class="kw">let </span>min_unix_time = -<span class="number">67768100567971200</span>;
<span class="kw">let </span>max_unix_time = <span class="number">67767976233532799</span>;
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
transition_rule_1.find_local_time_type(min_unix_time),
<span class="prelude-val">Err</span>(Error::OutOfRange(<span class="kw">_</span>))
));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
transition_rule_2.find_local_time_type(max_unix_time),
<span class="prelude-val">Err</span>(Error::OutOfRange(<span class="kw">_</span>))
));
<span class="prelude-val">Ok</span>(())
}
}
</code></pre></div>
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