Function datealgo::secs_to_systemtime

pub fn secs_to_systemtime((secs, nsecs): (i64, u32)) -> Option<SystemTime>

Convert seconds and nanoseconds to std::time::SystemTime

Given a tuple of seconds and nanoseconds counting from Unix epoch (January 1st, 1970) returns Option of std::time::SystemTime.

Errors

Returns None if given datetime cannot be represented as SystemTime.

Panics

Seconds must be between RD_SECONDS_MIN and RD_SECONDS_MAX inclusive. Nanoseconds must between 0 and 999_999_999. Bounds are checked using debug_assert only, so that the checks are not present in release builds, similar to integer overflow checks.

Examples

use datealgo::secs_to_systemtime;
use std::time::{Duration, UNIX_EPOCH};

assert_eq!(secs_to_systemtime((0, 0)), Some(UNIX_EPOCH));
assert_eq!(secs_to_systemtime((0, 1)), UNIX_EPOCH.checked_add(Duration::new(0, 1)));
assert_eq!(secs_to_systemtime((1, 0)), UNIX_EPOCH.checked_add(Duration::new(1, 0)));
assert_eq!(secs_to_systemtime((-1, 999_999_999)), UNIX_EPOCH.checked_sub(Duration::new(0, 1)));
assert_eq!(secs_to_systemtime((-1, 0)), UNIX_EPOCH.checked_sub(Duration::new(1, 0)));
assert_eq!(secs_to_systemtime((-2, 999_999_999)), UNIX_EPOCH.checked_sub(Duration::new(1, 1)));

Algorithm

Combination of existing functions for convenience only.