88 /// # OS-specific behaviors
90 /// An `Instant` is a wrapper around system-specific types and it may behave
109 /// |-----------|----------------------------------------------------------------------|
118 /// [currently]: crate::io#platform-specific-behavior
119 …eryPerformanceCounter]: https://docs.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileap…
121 /// [timekeeping in SGX]: https://edp.fortanix.com/docs/concepts/rust-std/#codestdtimecode
146 /// [tier 1]: https://doc.rust-lang.org/rustc/platform-support.html
173 /// fixed point in time, a `SystemTime` can be converted to a human-readable time,
203 /// # Platform-specific behavior
205 /// The precision of `SystemTime` can depend on the underlying OS-specific time format.
213 /// |-----------|----------------------------------------------------------------------|
222 /// [currently]: crate::io#platform-specific-behavior
224 /// [timekeeping in SGX]: https://edp.fortanix.com/docs/concepts/rust-std/#codestdtimecode
225 /// [gettimeofday]: https://man7.org/linux/man-pages/man2/gettimeofday.2.html
228 …TimePreciseAsFileTime]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoap…
229 …tSystemTimeAsFileTime]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoap…
275     pub fn now() -> Instant {  in now()
304     pub fn duration_since(&self, earlier: Instant) -> Duration {  in duration_since()
330     pub fn checked_duration_since(&self, earlier: Instant) -> Option<Duration> {  in checked_duration_since()
351     pub fn saturating_duration_since(&self, earlier: Instant) -> Duration {  in saturating_duration_since()
378     pub fn elapsed(&self) -> Duration {  in elapsed()
379         Instant::now() - *self  in elapsed()
386     pub fn checked_add(&self, duration: Duration) -> Option<Instant> {  in checked_add()
390     /// Returns `Some(t)` where `t` is the time `self - duration` if `t` can be represented as
394     pub fn checked_sub(&self, duration: Duration) -> Option<Instant> {  in checked_sub()
407     fn add(self, other: Duration) -> Instant {  in add()
423     fn sub(self, other: Duration) -> Instant {  in sub()
431         *self = *self - other;  in sub_assign()
449     fn sub(self, other: Instant) -> Duration {  in sub()
456     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {  in fmt()
465     /// This constant is defined to be "1970-01-01 00:00:00 UTC" on all systems with
477     ///     Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
495     pub fn now() -> SystemTime {  in now()
524     pub fn duration_since(&self, earlier: SystemTime) -> Result<Duration, SystemTimeError> {  in duration_since()
554     pub fn elapsed(&self) -> Result<Duration, SystemTimeError> {  in elapsed()
562     pub fn checked_add(&self, duration: Duration) -> Option<SystemTime> {  in checked_add()
566     /// Returns `Some(t)` where `t` is the time `self - duration` if `t` can be represented as
570     pub fn checked_sub(&self, duration: Duration) -> Option<SystemTime> {  in checked_sub()
583     fn add(self, dur: Duration) -> SystemTime {  in add()
599     fn sub(self, dur: Duration) -> SystemTime {  in sub()
607         *self = *self - other;  in sub_assign()
613     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {  in fmt()
621 /// This constant is defined to be "1970-01-01 00:00:00 UTC" on all systems with
633 ///     Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
664     pub fn duration(&self) -> Duration {  in duration()
672     fn description(&self) -> &str {  in description()
679     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {  in fmt()
685     fn from_inner(time: time::SystemTime) -> SystemTime {  in from_inner()
691     fn into_inner(self) -> time::SystemTime {  in into_inner()