Struct chrono::naive::time::NaiveTime

pub struct NaiveTime { /* fields omitted */ }

ISO 8601 time without timezone. Allows for the nanosecond precision and optional leap second representation.

Chrono has a notable policy on the leap second handling, designed to be maximally useful for typical users.

Methods

impl NaiveTime

fn from_hms(hour: u32, min: u32, sec: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute and second.

No leap second is allowed here; use NaiveTime::from_hms_* methods with a subsecond parameter instead.

Panics on invalid hour, minute and/or second.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms(23, 56, 4);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 0);

fn from_hms_opt(hour: u32, min: u32, sec: u32) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute and second.

No leap second is allowed here; use NaiveTime::from_hms_*_opt methods with a subsecond parameter instead.

Returns None on invalid hour, minute and/or second.

Example

use chrono::NaiveTime;

let from_hms_opt = NaiveTime::from_hms_opt;

assert!(from_hms_opt(0, 0, 0).is_some());
assert!(from_hms_opt(23, 59, 59).is_some());
assert!(from_hms_opt(24, 0, 0).is_none());
assert!(from_hms_opt(23, 60, 0).is_none());
assert!(from_hms_opt(23, 59, 60).is_none());

fn from_hms_milli(hour: u32, min: u32, sec: u32, milli: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or millisecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_milli(23, 56, 4, 12);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_000_000);

fn from_hms_milli_opt(
    hour: u32,
    min: u32,
    sec: u32,
    milli: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or millisecond.

Example

use chrono::NaiveTime;

let from_hmsm_opt = NaiveTime::from_hms_milli_opt;

assert!(from_hmsm_opt(0, 0, 0, 0).is_some());
assert!(from_hmsm_opt(23, 59, 59, 999).is_some());
assert!(from_hmsm_opt(23, 59, 59, 1_999).is_some()); // a leap second after 23:59:59
assert!(from_hmsm_opt(24, 0, 0, 0).is_none());
assert!(from_hmsm_opt(23, 60, 0, 0).is_none());
assert!(from_hmsm_opt(23, 59, 60, 0).is_none());
assert!(from_hmsm_opt(23, 59, 59, 2_000).is_none());

fn from_hms_micro(hour: u32, min: u32, sec: u32, micro: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or microsecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_micro(23, 56, 4, 12_345);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_000);

fn from_hms_micro_opt(
    hour: u32,
    min: u32,
    sec: u32,
    micro: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or microsecond.

Example

use chrono::NaiveTime;

let from_hmsu_opt = NaiveTime::from_hms_micro_opt;

assert!(from_hmsu_opt(0, 0, 0, 0).is_some());
assert!(from_hmsu_opt(23, 59, 59, 999_999).is_some());
assert!(from_hmsu_opt(23, 59, 59, 1_999_999).is_some()); // a leap second after 23:59:59
assert!(from_hmsu_opt(24, 0, 0, 0).is_none());
assert!(from_hmsu_opt(23, 60, 0, 0).is_none());
assert!(from_hmsu_opt(23, 59, 60, 0).is_none());
assert!(from_hmsu_opt(23, 59, 59, 2_000_000).is_none());

fn from_hms_nano(hour: u32, min: u32, sec: u32, nano: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or nanosecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_678);

fn from_hms_nano_opt(
    hour: u32,
    min: u32,
    sec: u32,
    nano: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or nanosecond.

Example

use chrono::NaiveTime;

let from_hmsn_opt = NaiveTime::from_hms_nano_opt;

assert!(from_hmsn_opt(0, 0, 0, 0).is_some());
assert!(from_hmsn_opt(23, 59, 59, 999_999_999).is_some());
assert!(from_hmsn_opt(23, 59, 59, 1_999_999_999).is_some()); // a leap second after 23:59:59
assert!(from_hmsn_opt(24, 0, 0, 0).is_none());
assert!(from_hmsn_opt(23, 60, 0, 0).is_none());
assert!(from_hmsn_opt(23, 59, 60, 0).is_none());
assert!(from_hmsn_opt(23, 59, 59, 2_000_000_000).is_none());

fn from_num_seconds_from_midnight(secs: u32, nano: u32) -> NaiveTime

Makes a new NaiveTime from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid number of seconds and/or nanosecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_num_seconds_from_midnight(86164, 12_345_678);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_678);

fn from_num_seconds_from_midnight_opt(secs: u32, nano: u32) -> Option<NaiveTime>

Makes a new NaiveTime from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns None on invalid number of seconds and/or nanosecond.

Example

use chrono::NaiveTime;

let from_nsecs_opt = NaiveTime::from_num_seconds_from_midnight_opt;

assert!(from_nsecs_opt(0, 0).is_some());
assert!(from_nsecs_opt(86399, 999_999_999).is_some());
assert!(from_nsecs_opt(86399, 1_999_999_999).is_some()); // a leap second after 23:59:59
assert!(from_nsecs_opt(86400, 0).is_none());
assert!(from_nsecs_opt(86399, 2_000_000_000).is_none());

fn parse_from_str(s: &str, fmt: &str) -> ParseResult<NaiveTime>

Parses a string with the specified format string and returns a new NaiveTime. See the format::strftime module on the supported escape sequences.

Example

use chrono::NaiveTime;

let parse_from_str = NaiveTime::parse_from_str;

assert_eq!(parse_from_str("23:56:04", "%H:%M:%S"),
           Ok(NaiveTime::from_hms(23, 56, 4)));
assert_eq!(parse_from_str("pm012345.6789", "%p%I%M%S%.f"),
           Ok(NaiveTime::from_hms_micro(13, 23, 45, 678_900)));

Date and offset is ignored for the purpose of parsing.

assert_eq!(parse_from_str("2014-5-17T12:34:56+09:30", "%Y-%m-%dT%H:%M:%S%z"),
           Ok(NaiveTime::from_hms(12, 34, 56)));

Leap seconds are correctly handled by treating any time of the form hh:mm:60 as a leap second. (This equally applies to the formatting, so the round trip is possible.)

assert_eq!(parse_from_str("08:59:60.123", "%H:%M:%S%.f"),
           Ok(NaiveTime::from_hms_milli(8, 59, 59, 1_123)));

Missing seconds are assumed to be zero, but out-of-bound times or insufficient fields are errors otherwise.

assert_eq!(parse_from_str("7:15", "%H:%M"),
           Ok(NaiveTime::from_hms(7, 15, 0)));

assert!(parse_from_str("04m33s", "%Mm%Ss").is_err());
assert!(parse_from_str("12", "%H").is_err());
assert!(parse_from_str("17:60", "%H:%M").is_err());
assert!(parse_from_str("24:00:00", "%H:%M:%S").is_err());

All parsed fields should be consistent to each other, otherwise it's an error. Here %H is for 24-hour clocks, unlike %I, and thus can be independently determined without AM/PM.

assert!(parse_from_str("13:07 AM", "%H:%M %p").is_err());

fn overflowing_add_signed(&self, rhs: OldDuration) -> (NaiveTime, i64)

Adds given Duration to the current time, and also returns the number of seconds in the integral number of days ignored from the addition. (We cannot return Duration because it is subject to overflow or underflow.)

Example

use chrono::NaiveTime;
use time::Duration;

let from_hms = NaiveTime::from_hms;

assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(11)),
           (from_hms(14, 4, 5), 0));
assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(23)),
           (from_hms(2, 4, 5), 86400));
assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(-7)),
           (from_hms(20, 4, 5), -86400));

fn overflowing_sub_signed(&self, rhs: OldDuration) -> (NaiveTime, i64)

Subtracts given Duration from the current time, and also returns the number of seconds in the integral number of days ignored from the subtraction. (We cannot return Duration because it is subject to overflow or underflow.)

Example

use chrono::NaiveTime;
use time::Duration;

let from_hms = NaiveTime::from_hms;

assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(2)),
           (from_hms(1, 4, 5), 0));
assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(17)),
           (from_hms(10, 4, 5), 86400));
assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(-22)),
           (from_hms(1, 4, 5), -86400));

fn signed_duration_since(self, rhs: NaiveTime) -> OldDuration

Subtracts another NaiveTime from the current time. Returns a Duration within +/- 1 day. This does not overflow or underflow at all.

As a part of Chrono's leap second handling, the subtraction assumes that there is no leap second ever, except when any of the NaiveTimes themselves represents a leap second in which case the assumption becomes that there are exactly one (or two) leap second(s) ever.

Example

use chrono::NaiveTime;
use time::Duration;

let from_hmsm = NaiveTime::from_hms_milli;
let since = NaiveTime::signed_duration_since;

assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 900)),
           Duration::zero());
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 875)),
           Duration::milliseconds(25));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 6, 925)),
           Duration::milliseconds(975));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 0, 900)),
           Duration::seconds(7));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 0, 7, 900)),
           Duration::seconds(5 * 60));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(0, 5, 7, 900)),
           Duration::seconds(3 * 3600));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(4, 5, 7, 900)),
           Duration::seconds(-3600));
assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(2, 4, 6, 800)),
           Duration::seconds(3600 + 60 + 1) + Duration::milliseconds(100));

Leap seconds are handled, but the subtraction assumes that there were no other leap seconds happened.

assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 59, 0)),
           Duration::seconds(1));
assert_eq!(since(from_hmsm(3, 0, 59, 1_500), from_hmsm(3, 0, 59, 0)),
           Duration::milliseconds(1500));
assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 0, 0)),
           Duration::seconds(60));
assert_eq!(since(from_hmsm(3, 0, 0, 0), from_hmsm(2, 59, 59, 1_000)),
           Duration::seconds(1));
assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(2, 59, 59, 1_000)),
           Duration::seconds(61));

fn format_with_items<'a, I>(&self, items: I) -> DelayedFormat<I> where
    I: Iterator<Item = Item<'a>> + Clone, 

Formats the time with the specified formatting items. Otherwise it is same to the ordinary format method.

The Iterator of items should be Cloneable, since the resulting DelayedFormat value may be formatted multiple times.

Example

use chrono::NaiveTime;
use chrono::format::strftime::StrftimeItems;

let fmt = StrftimeItems::new("%H:%M:%S");
let t = NaiveTime::from_hms(23, 56, 4);
assert_eq!(t.format_with_items(fmt.clone()).to_string(), "23:56:04");
assert_eq!(t.format("%H:%M:%S").to_string(),             "23:56:04");

The resulting DelayedFormat can be formatted directly via the Display trait.

assert_eq!(format!("{}", t.format_with_items(fmt)), "23:56:04");

fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>>

Formats the time with the specified format string. See the format::strftime module on the supported escape sequences.

This returns a DelayedFormat, which gets converted to a string only when actual formatting happens. You may use the to_string method to get a String, or just feed it into print! and other formatting macros. (In this way it avoids the redundant memory allocation.)

A wrong format string does not issue an error immediately. Rather, converting or formatting the DelayedFormat fails. You are recommended to immediately use DelayedFormat for this reason.

Example

use chrono::NaiveTime;

let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(t.format("%H:%M:%S").to_string(), "23:56:04");
assert_eq!(t.format("%H:%M:%S%.6f").to_string(), "23:56:04.012345");
assert_eq!(t.format("%-I:%M %p").to_string(), "11:56 PM");

The resulting DelayedFormat can be formatted directly via the Display trait.

assert_eq!(format!("{}", t.format("%H:%M:%S")), "23:56:04");
assert_eq!(format!("{}", t.format("%H:%M:%S%.6f")), "23:56:04.012345");
assert_eq!(format!("{}", t.format("%-I:%M %p")), "11:56 PM");

Trait Implementations

impl Add<FixedOffset> for NaiveTime

type Output = NaiveTime

The resulting type after applying the + operator

fn add(self, rhs: FixedOffset) -> NaiveTime

The method for the + operator

impl Sub<FixedOffset> for NaiveTime

type Output = NaiveTime

The resulting type after applying the - operator

fn sub(self, rhs: FixedOffset) -> NaiveTime

The method for the - operator

impl PartialEq for NaiveTime

fn eq(&self, __arg_0: &NaiveTime) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &NaiveTime) -> bool

This method tests for !=.

impl Eq for NaiveTime

impl PartialOrd for NaiveTime

fn partial_cmp(&self, __arg_0: &NaiveTime) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, __arg_0: &NaiveTime) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, __arg_0: &NaiveTime) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, __arg_0: &NaiveTime) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, __arg_0: &NaiveTime) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for NaiveTime

fn cmp(&self, __arg_0: &NaiveTime) -> Ordering

This method returns an Ordering between self and other.

impl Copy for NaiveTime

impl Clone for NaiveTime

fn clone(&self) -> NaiveTime

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Timelike for NaiveTime

fn hour(&self) -> u32

Returns the hour number from 0 to 23.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).hour(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).hour(), 23);

fn minute(&self) -> u32

Returns the minute number from 0 to 59.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).minute(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).minute(), 56);

fn second(&self) -> u32

Returns the second number from 0 to 59.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).second(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).second(), 4);

This method never returns 60 even when it is a leap second. (Why?) Use the proper formatting method to get a human-readable representation.

let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
assert_eq!(leap.second(), 59);
assert_eq!(leap.format("%H:%M:%S").to_string(), "23:59:60");

fn nanosecond(&self) -> u32

Returns the number of nanoseconds since the whole non-leap second. The range from 1,000,000,000 to 1,999,999,999 represents the leap second.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).nanosecond(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).nanosecond(), 12_345_678);

Leap seconds may have seemingly out-of-range return values. You can reduce the range with time.nanosecond() % 1_000_000_000, or use the proper formatting method to get a human-readable representation.

let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
assert_eq!(leap.nanosecond(), 1_000_000_000);
assert_eq!(leap.format("%H:%M:%S%.9f").to_string(), "23:59:60.000000000");

fn with_hour(&self, hour: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the hour number changed.

Returns None when the resulting NaiveTime would be invalid.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_hour(7), Some(NaiveTime::from_hms_nano(7, 56, 4, 12_345_678)));
assert_eq!(dt.with_hour(24), None);

fn with_minute(&self, min: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the minute number changed.

Returns None when the resulting NaiveTime would be invalid.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_minute(45), Some(NaiveTime::from_hms_nano(23, 45, 4, 12_345_678)));
assert_eq!(dt.with_minute(60), None);

fn with_second(&self, sec: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the second number changed.

Returns None when the resulting NaiveTime would be invalid. As with the second method, the input range is restricted to 0 through 59.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_second(17), Some(NaiveTime::from_hms_nano(23, 56, 17, 12_345_678)));
assert_eq!(dt.with_second(60), None);

fn with_nanosecond(&self, nano: u32) -> Option<NaiveTime>

Makes a new NaiveTime with nanoseconds since the whole non-leap second changed.

Returns None when the resulting NaiveTime would be invalid. As with the nanosecond method, the input range can exceed 1,000,000,000 for leap seconds.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_nanosecond(333_333_333),
           Some(NaiveTime::from_hms_nano(23, 56, 4, 333_333_333)));
assert_eq!(dt.with_nanosecond(2_000_000_000), None);

Leap seconds can theoretically follow any whole second. The following would be a proper leap second at the time zone offset of UTC-00:03:57 (there are several historical examples comparable to this "non-sense" offset), and therefore is allowed.

assert_eq!(dt.with_nanosecond(1_333_333_333),
           Some(NaiveTime::from_hms_nano(23, 56, 4, 1_333_333_333)));

fn num_seconds_from_midnight(&self) -> u32

Returns the number of non-leap seconds past the last midnight.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(1, 2, 3).num_seconds_from_midnight(),
           3723);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).num_seconds_from_midnight(),
           86164);
assert_eq!(NaiveTime::from_hms_milli(23, 59, 59, 1_000).num_seconds_from_midnight(),
           86399);

fn hour12(&self) -> (bool, u32)

Returns the hour number from 1 to 12 with a boolean flag, which is false for AM and true for PM.

impl Hash for NaiveTime

NaiveTime can be used as a key to the hash maps (in principle).

Practically this also takes account of fractional seconds, so it is not recommended. (For the obvious reason this also distinguishes leap seconds from non-leap seconds.)

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Add<OldDuration> for NaiveTime

An addition of Duration to NaiveTime wraps around and never overflows or underflows. In particular the addition ignores integral number of days.

As a part of Chrono's leap second handling, the addition assumes that there is no leap second ever, except when the NaiveTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Example

use chrono::NaiveTime;
use time::Duration;

let from_hmsm = NaiveTime::from_hms_milli;

assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::zero(),                  from_hmsm(3, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(1),              from_hmsm(3, 5, 8, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-1),             from_hmsm(3, 5, 6, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(60 + 4),         from_hmsm(3, 6, 11, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(7*60*60 - 6*60), from_hmsm(9, 59, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::milliseconds(80),        from_hmsm(3, 5, 7, 80));
assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(280),     from_hmsm(3, 5, 8, 230));
assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(-980),    from_hmsm(3, 5, 6, 970));

The addition wraps around.

assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(22*60*60), from_hmsm(1, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-8*60*60), from_hmsm(19, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::days(800),         from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the addition assumes that it is the only leap second happened.

let leap = from_hmsm(3, 5, 59, 1_300);
assert_eq!(leap + Duration::zero(),             from_hmsm(3, 5, 59, 1_300));
assert_eq!(leap + Duration::milliseconds(-500), from_hmsm(3, 5, 59, 800));
assert_eq!(leap + Duration::milliseconds(500),  from_hmsm(3, 5, 59, 1_800));
assert_eq!(leap + Duration::milliseconds(800),  from_hmsm(3, 6, 0, 100));
assert_eq!(leap + Duration::seconds(10),        from_hmsm(3, 6, 9, 300));
assert_eq!(leap + Duration::seconds(-10),       from_hmsm(3, 5, 50, 300));
assert_eq!(leap + Duration::days(1),            from_hmsm(3, 5, 59, 300));

type Output = NaiveTime

The resulting type after applying the + operator

fn add(self, rhs: OldDuration) -> NaiveTime

The method for the + operator

impl Sub<OldDuration> for NaiveTime

A subtraction of Duration from NaiveTime wraps around and never overflows or underflows. In particular the addition ignores integral number of days. It is same to the addition with a negated Duration.

As a part of Chrono's leap second handling, the addition assumes that there is no leap second ever, except when the NaiveTime itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

Example

use chrono::NaiveTime;
use time::Duration;

let from_hmsm = NaiveTime::from_hms_milli;

assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::zero(),                  from_hmsm(3, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(1),              from_hmsm(3, 5, 6, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(60 + 5),         from_hmsm(3, 4, 2, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(2*60*60 + 6*60), from_hmsm(0, 59, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::milliseconds(80),        from_hmsm(3, 5, 6, 920));
assert_eq!(from_hmsm(3, 5, 7, 950) - Duration::milliseconds(280),     from_hmsm(3, 5, 7, 670));

The subtraction wraps around.

assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(8*60*60), from_hmsm(19, 5, 7, 0));
assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::days(800),        from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the subtraction assumes that it is the only leap second happened.

let leap = from_hmsm(3, 5, 59, 1_300);
assert_eq!(leap - Duration::zero(),            from_hmsm(3, 5, 59, 1_300));
assert_eq!(leap - Duration::milliseconds(200), from_hmsm(3, 5, 59, 1_100));
assert_eq!(leap - Duration::milliseconds(500), from_hmsm(3, 5, 59, 800));
assert_eq!(leap - Duration::seconds(60),       from_hmsm(3, 5, 0, 300));
assert_eq!(leap - Duration::days(1),           from_hmsm(3, 6, 0, 300));

type Output = NaiveTime

The resulting type after applying the - operator

fn sub(self, rhs: OldDuration) -> NaiveTime

The method for the - operator

impl Debug for NaiveTime

The Debug output of the naive time t is same to t.format("%H:%M:%S%.f").

The string printed can be readily parsed via the parse method on str.

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

Example

use chrono::NaiveTime;

assert_eq!(format!("{:?}", NaiveTime::from_hms(23, 56, 4)),              "23:56:04");
assert_eq!(format!("{:?}", NaiveTime::from_hms_milli(23, 56, 4, 12)),    "23:56:04.012");
assert_eq!(format!("{:?}", NaiveTime::from_hms_micro(23, 56, 4, 1234)),  "23:56:04.001234");
assert_eq!(format!("{:?}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");

Leap seconds may also be used.

assert_eq!(format!("{:?}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Display for NaiveTime

The Display output of the naive time t is same to t.format("%H:%M:%S%.f").

The string printed can be readily parsed via the parse method on str.

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

Example

use chrono::NaiveTime;

assert_eq!(format!("{}", NaiveTime::from_hms(23, 56, 4)),              "23:56:04");
assert_eq!(format!("{}", NaiveTime::from_hms_milli(23, 56, 4, 12)),    "23:56:04.012");
assert_eq!(format!("{}", NaiveTime::from_hms_micro(23, 56, 4, 1234)),  "23:56:04.001234");
assert_eq!(format!("{}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");

Leap seconds may also be used.

assert_eq!(format!("{}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl FromStr for NaiveTime

Parsing a str into a NaiveTime uses the same format, %H:%M:%S%.f, as in Debug and Display.

Example

use chrono::NaiveTime;

let t = NaiveTime::from_hms(23, 56, 4);
assert_eq!("23:56:04".parse::<NaiveTime>(), Ok(t));

let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!("23:56:4.012345678".parse::<NaiveTime>(), Ok(t));

let t = NaiveTime::from_hms_nano(23, 59, 59, 1_234_567_890); // leap second
assert_eq!("23:59:60.23456789".parse::<NaiveTime>(), Ok(t));

assert!("foo".parse::<NaiveTime>().is_err());

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> ParseResult<NaiveTime>

Parses a string s to return a value of this type.