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use chrono::{
DateTime, FixedOffset as Offset, Local, NaiveDateTime, NaiveTime, TimeZone, Timelike, Utc,
};
/// A convenience wrapper around [DateTime][t] with fixed timezone
///
/// [t]: chrono::DateTime
pub struct Time {
inner: DateTime<Offset>,
}
impl Time {
/// Get the current local time and pin it to a fixed Tz offset
pub fn now() -> Self {
let now = Local::now();
Self {
inner: build_datetime(now.time()),
}
}
#[cfg(test)]
pub(crate) fn fixed(hour: u32, min: u32, sec: u32) -> Self {
Self {
inner: build_datetime(NaiveTime::from_hms(hour, min, sec)),
}
}
/// Return a new instance that is rounded to nearest 15 minutes
///
/// It uses the internally provided offset to do rounding, meaning
/// that the timezone information will not change, even when
/// rounding values that were created in a different timezone.
pub fn round(&self) -> Self {
let naive = self.inner.time();
let (new_min, incr_hour) = match naive.minute() {
// 0-7 => (0, false)
m if m > 0 && m < 7 => (0, false),
// 7-22 => (15, false)
m if m >= 7 && m < 22 => (15, false),
// 22-37 => (30, false)
m if m >= 22 && m < 37 => (30, false),
// 37-52 => (45, false)
m if m >= 37 && m < 52 => (45, false),
// 52-59 => (0, true)
m if m >= 52 && m <= 59 => (0, true),
_ => unreachable!(),
};
let hour = naive.hour();
let new = NaiveTime::from_hms(if incr_hour { hour + 1 } else { hour }, new_min, 0);
let offset = self.inner.offset();
let date = self.inner.date();
Self {
inner: DateTime::from_utc(NaiveDateTime::new(date.naive_local(), new), *offset),
}
}
pub fn hour(&self) -> u32 {
self.inner.hour()
}
pub fn minute(&self) -> u32 {
self.inner.minute()
}
pub fn second(&self) -> u32 {
self.inner.second()
}
}
/// Build a DateTime with the current local fixed offset
fn build_datetime(nt: NaiveTime) -> DateTime<Offset> {
let date = Utc::now().date().naive_local();
let offset = Local.offset_from_utc_date(&date);
DateTime::from_utc(NaiveDateTime::new(date, nt), offset)
}
#[test]
fn simple() {
let t = Time::fixed(10, 44, 0);
let round = t.round();
assert_eq!(round.minute(), 45);
let t = Time::fixed(6, 8, 0);
let round = t.round();
assert_eq!(round.minute(), 15);
let t = Time::fixed(6, 55, 0);
let round = t.round();
assert_eq!(round.minute(), 0);
assert_eq!(round.hour(), 7);
}
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