//! The [`Time`] struct and its associated `impl`s.
use core::fmt;
use core::ops::{Add, Sub};
use core::time::Duration as StdDuration;
#[cfg(feature = "formatting")]
use std::io;
#[cfg(feature = "formatting")]
use crate::formatting::Formattable;
#[cfg(feature = "parsing")]
use crate::parsing::Parsable;
use crate::util::DateAdjustment;
use crate::{error, Duration};
/// By explicitly inserting this enum where padding is expected, the compiler is able to better
/// perform niche value optimization.
#[repr(u8)]
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub(crate) enum Padding {
#[allow(clippy::missing_docs_in_private_items)]
Optimize,
}
/// The clock time within a given date. Nanosecond precision.
///
/// All minutes are assumed to have exactly 60 seconds; no attempt is made to handle leap seconds
/// (either positive or negative).
///
/// When comparing two `Time`s, they are assumed to be in the same calendar date.
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Time {
#[allow(clippy::missing_docs_in_private_items)]
hour: u8,
#[allow(clippy::missing_docs_in_private_items)]
minute: u8,
#[allow(clippy::missing_docs_in_private_items)]
second: u8,
#[allow(clippy::missing_docs_in_private_items)]
nanosecond: u32,
#[allow(clippy::missing_docs_in_private_items)]
padding: Padding,
}
impl Time {
/// Create a `Time` that is exactly midnight.
///
/// ```rust
/// # use time::Time;
/// # use time_macros::time;
/// assert_eq!(Time::MIDNIGHT, time!(0:00));
/// ```
pub const MIDNIGHT: Self = Self::__from_hms_nanos_unchecked(0, 0, 0, 0);
/// The smallest value that can be represented by `Time`.
///
/// `00:00:00.0`
pub(crate) const MIN: Self = Self::__from_hms_nanos_unchecked(0, 0, 0, 0);
/// The largest value that can be represented by `Time`.
///
/// `23:59:59.999_999_999`
pub(crate) const MAX: Self = Self::__from_hms_nanos_unchecked(23, 59, 59, 999_999_999);
// region: constructors
/// Create a `Time` from its components.
#[doc(hidden)]
pub const fn __from_hms_nanos_unchecked(
hour: u8,
minute: u8,
second: u8,
nanosecond: u32,
) -> Self {
debug_assert!(hour < 24);
debug_assert!(minute < 60);
debug_assert!(second < 60);
debug_assert!(nanosecond < 1_000_000_000);
Self {
hour,
minute,
second,
nanosecond,
padding: Padding::Optimize,
}
}
/// Attempt to create a `Time` from the hour, minute, and second.
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms(1, 2, 3).is_ok());
/// ```
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms(24, 0, 0).is_err()); // 24 isn't a valid hour.
/// assert!(Time::from_hms(0, 60, 0).is_err()); // 60 isn't a valid minute.
/// assert!(Time::from_hms(0, 0, 60).is_err()); // 60 isn't a valid second.
/// ```
pub const fn from_hms(hour: u8, minute: u8, second: u8) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(hour in 0 => 23);
ensure_value_in_range!(minute in 0 => 59);
ensure_value_in_range!(second in 0 => 59);
Ok(Self::__from_hms_nanos_unchecked(hour, minute, second, 0))
}
/// Attempt to create a `Time` from the hour, minute, second, and millisecond.
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_milli(1, 2, 3, 4).is_ok());
/// ```
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_milli(24, 0, 0, 0).is_err()); // 24 isn't a valid hour.
/// assert!(Time::from_hms_milli(0, 60, 0, 0).is_err()); // 60 isn't a valid minute.
/// assert!(Time::from_hms_milli(0, 0, 60, 0).is_err()); // 60 isn't a valid second.
/// assert!(Time::from_hms_milli(0, 0, 0, 1_000).is_err()); // 1_000 isn't a valid millisecond.
/// ```
pub const fn from_hms_milli(
hour: u8,
minute: u8,
second: u8,
millisecond: u16,
) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(hour in 0 => 23);
ensure_value_in_range!(minute in 0 => 59);
ensure_value_in_range!(second in 0 => 59);
ensure_value_in_range!(millisecond in 0 => 999);
Ok(Self::__from_hms_nanos_unchecked(
hour,
minute,
second,
millisecond as u32 * 1_000_000,
))
}
/// Attempt to create a `Time` from the hour, minute, second, and microsecond.
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_micro(1, 2, 3, 4).is_ok());
/// ```
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_micro(24, 0, 0, 0).is_err()); // 24 isn't a valid hour.
/// assert!(Time::from_hms_micro(0, 60, 0, 0).is_err()); // 60 isn't a valid minute.
/// assert!(Time::from_hms_micro(0, 0, 60, 0).is_err()); // 60 isn't a valid second.
/// assert!(Time::from_hms_micro(0, 0, 0, 1_000_000).is_err()); // 1_000_000 isn't a valid microsecond.
/// ```
pub const fn from_hms_micro(
hour: u8,
minute: u8,
second: u8,
microsecond: u32,
) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(hour in 0 => 23);
ensure_value_in_range!(minute in 0 => 59);
ensure_value_in_range!(second in 0 => 59);
ensure_value_in_range!(microsecond in 0 => 999_999);
Ok(Self::__from_hms_nanos_unchecked(
hour,
minute,
second,
microsecond * 1_000,
))
}
/// Attempt to create a `Time` from the hour, minute, second, and nanosecond.
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_nano(1, 2, 3, 4).is_ok());
/// ```
///
/// ```rust
/// # use time::Time;
/// assert!(Time::from_hms_nano(24, 0, 0, 0).is_err()); // 24 isn't a valid hour.
/// assert!(Time::from_hms_nano(0, 60, 0, 0).is_err()); // 60 isn't a valid minute.
/// assert!(Time::from_hms_nano(0, 0, 60, 0).is_err()); // 60 isn't a valid second.
/// assert!(Time::from_hms_nano(0, 0, 0, 1_000_000_000).is_err()); // 1_000_000_000 isn't a valid nanosecond.
/// ```
pub const fn from_hms_nano(
hour: u8,
minute: u8,
second: u8,
nanosecond: u32,
) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(hour in 0 => 23);
ensure_value_in_range!(minute in 0 => 59);
ensure_value_in_range!(second in 0 => 59);
ensure_value_in_range!(nanosecond in 0 => 999_999_999);
Ok(Self::__from_hms_nanos_unchecked(
hour, minute, second, nanosecond,
))
}
// endregion constructors
// region: getters
/// Get the clock hour, minute, and second.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).as_hms(), (0, 0, 0));
/// assert_eq!(time!(23:59:59).as_hms(), (23, 59, 59));
/// ```
pub const fn as_hms(self) -> (u8, u8, u8) {
(self.hour, self.minute, self.second)
}
/// Get the clock hour, minute, second, and millisecond.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).as_hms_milli(), (0, 0, 0, 0));
/// assert_eq!(time!(23:59:59.999).as_hms_milli(), (23, 59, 59, 999));
/// ```
pub const fn as_hms_milli(self) -> (u8, u8, u8, u16) {
(
self.hour,
self.minute,
self.second,
(self.nanosecond / 1_000_000) as u16,
)
}
/// Get the clock hour, minute, second, and microsecond.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).as_hms_micro(), (0, 0, 0, 0));
/// assert_eq!(
/// time!(23:59:59.999_999).as_hms_micro(),
/// (23, 59, 59, 999_999)
/// );
/// ```
pub const fn as_hms_micro(self) -> (u8, u8, u8, u32) {
(self.hour, self.minute, self.second, self.nanosecond / 1_000)
}
/// Get the clock hour, minute, second, and nanosecond.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).as_hms_nano(), (0, 0, 0, 0));
/// assert_eq!(
/// time!(23:59:59.999_999_999).as_hms_nano(),
/// (23, 59, 59, 999_999_999)
/// );
/// ```
pub const fn as_hms_nano(self) -> (u8, u8, u8, u32) {
(self.hour, self.minute, self.second, self.nanosecond)
}
/// Get the clock hour.
///
/// The returned value will always be in the range `0..24`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).hour(), 0);
/// assert_eq!(time!(23:59:59).hour(), 23);
/// ```
pub const fn hour(self) -> u8 {
self.hour
}
/// Get the minute within the hour.
///
/// The returned value will always be in the range `0..60`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).minute(), 0);
/// assert_eq!(time!(23:59:59).minute(), 59);
/// ```
pub const fn minute(self) -> u8 {
self.minute
}
/// Get the second within the minute.
///
/// The returned value will always be in the range `0..60`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00:00).second(), 0);
/// assert_eq!(time!(23:59:59).second(), 59);
/// ```
pub const fn second(self) -> u8 {
self.second
}
/// Get the milliseconds within the second.
///
/// The returned value will always be in the range `0..1_000`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00).millisecond(), 0);
/// assert_eq!(time!(23:59:59.999).millisecond(), 999);
/// ```
pub const fn millisecond(self) -> u16 {
(self.nanosecond / 1_000_000) as _
}
/// Get the microseconds within the second.
///
/// The returned value will always be in the range `0..1_000_000`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00).microsecond(), 0);
/// assert_eq!(time!(23:59:59.999_999).microsecond(), 999_999);
/// ```
pub const fn microsecond(self) -> u32 {
self.nanosecond / 1_000
}
/// Get the nanoseconds within the second.
///
/// The returned value will always be in the range `0..1_000_000_000`.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(time!(0:00).nanosecond(), 0);
/// assert_eq!(time!(23:59:59.999_999_999).nanosecond(), 999_999_999);
/// ```
pub const fn nanosecond(self) -> u32 {
self.nanosecond
}
// endregion getters
// region: arithmetic helpers
/// Add the sub-day time of the [`Duration`] to the `Time`. Wraps on overflow, returning whether
/// the date is different.
pub(crate) const fn adjusting_add(self, duration: Duration) -> (DateAdjustment, Self) {
let mut nanoseconds = self.nanosecond as i32 + duration.subsec_nanoseconds();
let mut seconds = self.second as i8 + (duration.whole_seconds() % 60) as i8;
let mut minutes = self.minute as i8 + (duration.whole_minutes() % 60) as i8;
let mut hours = self.hour as i8 + (duration.whole_hours() % 24) as i8;
let mut date_adjustment = DateAdjustment::None;
cascade!(nanoseconds in 0..1_000_000_000 => seconds);
cascade!(seconds in 0..60 => minutes);
cascade!(minutes in 0..60 => hours);
if hours >= 24 {
hours -= 24;
date_adjustment = DateAdjustment::Next;
} else if hours < 0 {
hours += 24;
date_adjustment = DateAdjustment::Previous;
}
(
date_adjustment,
Self::__from_hms_nanos_unchecked(
hours as _,
minutes as _,
seconds as _,
nanoseconds as _,
),
)
}
/// Subtract the sub-day time of the [`Duration`] to the `Time`. Wraps on overflow, returning
/// whether the date is different.
pub(crate) const fn adjusting_sub(self, duration: Duration) -> (DateAdjustment, Self) {
let mut nanoseconds = self.nanosecond as i32 - duration.subsec_nanoseconds();
let mut seconds = self.second as i8 - (duration.whole_seconds() % 60) as i8;
let mut minutes = self.minute as i8 - (duration.whole_minutes() % 60) as i8;
let mut hours = self.hour as i8 - (duration.whole_hours() % 24) as i8;
let mut date_adjustment = DateAdjustment::None;
cascade!(nanoseconds in 0..1_000_000_000 => seconds);
cascade!(seconds in 0..60 => minutes);
cascade!(minutes in 0..60 => hours);
if hours >= 24 {
hours -= 24;
date_adjustment = DateAdjustment::Next;
} else if hours < 0 {
hours += 24;
date_adjustment = DateAdjustment::Previous;
}
(
date_adjustment,
Self::__from_hms_nanos_unchecked(
hours as _,
minutes as _,
seconds as _,
nanoseconds as _,
),
)
}
/// Add the sub-day time of the [`std::time::Duration`] to the `Time`. Wraps on overflow,
/// returning whether the date is the previous date as the first element of the tuple.
pub(crate) const fn adjusting_add_std(self, duration: StdDuration) -> (bool, Self) {
let mut nanosecond = self.nanosecond + duration.subsec_nanos();
let mut second = self.second + (duration.as_secs() % 60) as u8;
let mut minute = self.minute + ((duration.as_secs() / 60) % 60) as u8;
let mut hour = self.hour + ((duration.as_secs() / 3_600) % 24) as u8;
let mut is_next_day = false;
cascade!(nanosecond in 0..1_000_000_000 => second);
cascade!(second in 0..60 => minute);
cascade!(minute in 0..60 => hour);
if hour >= 24 {
hour -= 24;
is_next_day = true;
}
(
is_next_day,
Self::__from_hms_nanos_unchecked(hour, minute, second, nanosecond),
)
}
/// Subtract the sub-day time of the [`std::time::Duration`] to the `Time`. Wraps on overflow,
/// returning whether the date is the previous date as the first element of the tuple.
pub(crate) const fn adjusting_sub_std(self, duration: StdDuration) -> (bool, Self) {
let mut nanosecond = self.nanosecond as i32 - duration.subsec_nanos() as i32;
let mut second = self.second as i8 - (duration.as_secs() % 60) as i8;
let mut minute = self.minute as i8 - ((duration.as_secs() / 60) % 60) as i8;
let mut hour = self.hour as i8 - ((duration.as_secs() / 3_600) % 24) as i8;
let mut is_previous_day = false;
cascade!(nanosecond in 0..1_000_000_000 => second);
cascade!(second in 0..60 => minute);
cascade!(minute in 0..60 => hour);
if hour < 0 {
hour += 24;
is_previous_day = true;
}
(
is_previous_day,
Self::__from_hms_nanos_unchecked(hour as _, minute as _, second as _, nanosecond as _),
)
}
// endregion arithmetic helpers
// region: replacement
/// Replace the clock hour.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_hour(7),
/// Ok(time!(07:02:03.004_005_006))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_hour(24).is_err()); // 24 isn't a valid hour
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_hour(self, hour: u8) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(hour in 0 => 23);
Ok(Self::__from_hms_nanos_unchecked(
hour,
self.minute,
self.second,
self.nanosecond,
))
}
/// Replace the minutes within the hour.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_minute(7),
/// Ok(time!(01:07:03.004_005_006))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_minute(60).is_err()); // 60 isn't a valid minute
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_minute(self, minute: u8) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(minute in 0 => 59);
Ok(Self::__from_hms_nanos_unchecked(
self.hour,
minute,
self.second,
self.nanosecond,
))
}
/// Replace the seconds within the minute.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_second(7),
/// Ok(time!(01:02:07.004_005_006))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_second(60).is_err()); // 60 isn't a valid second
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_second(self, second: u8) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(second in 0 => 59);
Ok(Self::__from_hms_nanos_unchecked(
self.hour,
self.minute,
second,
self.nanosecond,
))
}
/// Replace the milliseconds within the second.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_millisecond(7),
/// Ok(time!(01:02:03.007))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_millisecond(1_000).is_err()); // 1_000 isn't a valid millisecond
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_millisecond(
self,
millisecond: u16,
) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(millisecond in 0 => 999);
Ok(Self::__from_hms_nanos_unchecked(
self.hour,
self.minute,
self.second,
millisecond as u32 * 1_000_000,
))
}
/// Replace the microseconds within the second.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_microsecond(7_008),
/// Ok(time!(01:02:03.007_008))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_microsecond(1_000_000).is_err()); // 1_000_000 isn't a valid microsecond
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_microsecond(
self,
microsecond: u32,
) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(microsecond in 0 => 999_999);
Ok(Self::__from_hms_nanos_unchecked(
self.hour,
self.minute,
self.second,
microsecond * 1000,
))
}
/// Replace the nanoseconds within the second.
///
/// ```rust
/// # use time_macros::time;
/// assert_eq!(
/// time!(01:02:03.004_005_006).replace_nanosecond(7_008_009),
/// Ok(time!(01:02:03.007_008_009))
/// );
/// assert!(time!(01:02:03.004_005_006).replace_nanosecond(1_000_000_000).is_err()); // 1_000_000_000 isn't a valid nanosecond
/// ```
#[must_use = "This method does not mutate the original `Time`."]
pub const fn replace_nanosecond(self, nanosecond: u32) -> Result<Self, error::ComponentRange> {
ensure_value_in_range!(nanosecond in 0 => 999_999_999);
Ok(Self::__from_hms_nanos_unchecked(
self.hour,
self.minute,
self.second,
nanosecond,
))
}
// endregion replacement
}
// region: formatting & parsing
#[cfg(feature = "formatting")]
impl Time {
/// Format the `Time` using the provided [format description](crate::format_description).
pub fn format_into(
self,
output: &mut impl io::Write,
format: &(impl Formattable + ?Sized),
) -> Result<usize, crate::error::Format> {
format.format_into(output, None, Some(self), None)
}
/// Format the `Time` using the provided [format description](crate::format_description).
///
/// ```rust
/// # use time::format_description;
/// # use time_macros::time;
/// let format = format_description::parse("[hour]:[minute]:[second]")?;
/// assert_eq!(time!(12:00).format(&format)?, "12:00:00");
/// # Ok::<_, time::Error>(())
/// ```
pub fn format(
self,
format: &(impl Formattable + ?Sized),
) -> Result<String, crate::error::Format> {
format.format(None, Some(self), None)
}
}
#[cfg(feature = "parsing")]
impl Time {
/// Parse a `Time` from the input using the provided [format
/// description](crate::format_description).
///
/// ```rust
/// # use time::Time;
/// # use time_macros::{time, format_description};
/// let format = format_description!("[hour]:[minute]:[second]");
/// assert_eq!(Time::parse("12:00:00", &format)?, time!(12:00));
/// # Ok::<_, time::Error>(())
/// ```
pub fn parse(
input: &str,
description: &(impl Parsable + ?Sized),
) -> Result<Self, error::Parse> {
description.parse_time(input.as_bytes())
}
}
impl fmt::Display for Time {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let (value, width) = match self.nanosecond() {
nanos if nanos % 10 != 0 => (nanos, 9),
nanos if (nanos / 10) % 10 != 0 => (nanos / 10, 8),
nanos if (nanos / 100) % 10 != 0 => (nanos / 100, 7),
nanos if (nanos / 1_000) % 10 != 0 => (nanos / 1_000, 6),
nanos if (nanos / 10_000) % 10 != 0 => (nanos / 10_000, 5),
nanos if (nanos / 100_000) % 10 != 0 => (nanos / 100_000, 4),
nanos if (nanos / 1_000_000) % 10 != 0 => (nanos / 1_000_000, 3),
nanos if (nanos / 10_000_000) % 10 != 0 => (nanos / 10_000_000, 2),
nanos => (nanos / 100_000_000, 1),
};
write!(
f,
"{}:{:02}:{:02}.{value:0width$}",
self.hour, self.minute, self.second,
)
}
}
impl fmt::Debug for Time {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(self, f)
}
}
// endregion formatting & parsing
// region: trait impls
impl Add<Duration> for Time {
type Output = Self;
/// Add the sub-day time of the [`Duration`] to the `Time`. Wraps on overflow.
///
/// ```rust
/// # use time::ext::NumericalDuration;
/// # use time_macros::time;
/// assert_eq!(time!(12:00) + 2.hours(), time!(14:00));
/// assert_eq!(time!(0:00:01) + (-2).seconds(), time!(23:59:59));
/// ```
fn add(self, duration: Duration) -> Self::Output {
self.adjusting_add(duration).1
}
}
impl Add<StdDuration> for Time {
type Output = Self;
/// Add the sub-day time of the [`std::time::Duration`] to the `Time`. Wraps on overflow.
///
/// ```rust
/// # use time::ext::NumericalStdDuration;
/// # use time_macros::time;
/// assert_eq!(time!(12:00) + 2.std_hours(), time!(14:00));
/// assert_eq!(time!(23:59:59) + 2.std_seconds(), time!(0:00:01));
/// ```
fn add(self, duration: StdDuration) -> Self::Output {
self.adjusting_add_std(duration).1
}
}
impl_add_assign!(Time: Duration, StdDuration);
impl Sub<Duration> for Time {
type Output = Self;
/// Subtract the sub-day time of the [`Duration`] from the `Time`. Wraps on overflow.
///
/// ```rust
/// # use time::ext::NumericalDuration;
/// # use time_macros::time;
/// assert_eq!(time!(14:00) - 2.hours(), time!(12:00));
/// assert_eq!(time!(23:59:59) - (-2).seconds(), time!(0:00:01));
/// ```
fn sub(self, duration: Duration) -> Self::Output {
self.adjusting_sub(duration).1
}
}
impl Sub<StdDuration> for Time {
type Output = Self;
/// Subtract the sub-day time of the [`std::time::Duration`] from the `Time`. Wraps on overflow.
///
/// ```rust
/// # use time::ext::NumericalStdDuration;
/// # use time_macros::time;
/// assert_eq!(time!(14:00) - 2.std_hours(), time!(12:00));
/// assert_eq!(time!(0:00:01) - 2.std_seconds(), time!(23:59:59));
/// ```
fn sub(self, duration: StdDuration) -> Self::Output {
self.adjusting_sub_std(duration).1
}
}
impl_sub_assign!(Time: Duration, StdDuration);
impl Sub for Time {
type Output = Duration;
/// Subtract two `Time`s, returning the [`Duration`] between. This assumes both `Time`s are in
/// the same calendar day.
///
/// ```rust
/// # use time::ext::NumericalDuration;
/// # use time_macros::time;
/// assert_eq!(time!(0:00) - time!(0:00), 0.seconds());
/// assert_eq!(time!(1:00) - time!(0:00), 1.hours());
/// assert_eq!(time!(0:00) - time!(1:00), (-1).hours());
/// assert_eq!(time!(0:00) - time!(23:00), (-23).hours());
/// ```
fn sub(self, rhs: Self) -> Self::Output {
let hour_diff = (self.hour as i8) - (rhs.hour as i8);
let minute_diff = (self.minute as i8) - (rhs.minute as i8);
let second_diff = (self.second as i8) - (rhs.second as i8);
let nanosecond_diff = (self.nanosecond as i32) - (rhs.nanosecond as i32);
let seconds = hour_diff as i64 * 3_600 + minute_diff as i64 * 60 + second_diff as i64;
let (seconds, nanoseconds) = if seconds > 0 && nanosecond_diff < 0 {
(seconds - 1, nanosecond_diff + 1_000_000_000)
} else if seconds < 0 && nanosecond_diff > 0 {
(seconds + 1, nanosecond_diff - 1_000_000_000)
} else {
(seconds, nanosecond_diff)
};
Duration::new_unchecked(seconds, nanoseconds)
}
}
// endregion trait impls