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// This is a part of Chrono.
// See README.md and LICENSE.txt for details.
//! ISO 8601 calendar date with time zone.
#[cfg(any(feature = "alloc", feature = "std", test))]
use core::borrow::Borrow;
use core::cmp::Ordering;
use core::ops::{Add, Sub};
use core::{fmt, hash};
use oldtime::Duration as OldDuration;
#[cfg(feature = "unstable-locales")]
use format::Locale;
#[cfg(any(feature = "alloc", feature = "std", test))]
use format::{DelayedFormat, Item, StrftimeItems};
use naive::{self, IsoWeek, NaiveDate, NaiveTime};
use offset::{TimeZone, Utc};
use DateTime;
use {Datelike, Weekday};
/// ISO 8601 calendar date with time zone.
///
/// This type should be considered ambiguous at best,
/// due to the inherent lack of precision required for the time zone resolution.
/// For serialization and deserialization uses, it is best to use `NaiveDate` instead.
/// There are some guarantees on the usage of `Date<Tz>`:
///
/// - If properly constructed via `TimeZone::ymd` and others without an error,
/// the corresponding local date should exist for at least a moment.
/// (It may still have a gap from the offset changes.)
///
/// - The `TimeZone` is free to assign *any* `Offset` to the local date,
/// as long as that offset did occur in given day.
/// For example, if `2015-03-08T01:59-08:00` is followed by `2015-03-08T03:00-07:00`,
/// it may produce either `2015-03-08-08:00` or `2015-03-08-07:00`
/// but *not* `2015-03-08+00:00` and others.
///
/// - Once constructed as a full `DateTime`,
/// `DateTime::date` and other associated methods should return those for the original `Date`.
/// For example, if `dt = tz.ymd(y,m,d).hms(h,n,s)` were valid, `dt.date() == tz.ymd(y,m,d)`.
///
/// - The date is timezone-agnostic up to one day (i.e. practically always),
/// so the local date and UTC date should be equal for most cases
/// even though the raw calculation between `NaiveDate` and `Duration` may not.
#[derive(Clone)]
pub struct Date<Tz: TimeZone> {
date: NaiveDate,
offset: Tz::Offset,
}
/// The minimum possible `Date`.
pub const MIN_DATE: Date<Utc> = Date { date: naive::MIN_DATE, offset: Utc };
/// The maximum possible `Date`.
pub const MAX_DATE: Date<Utc> = Date { date: naive::MAX_DATE, offset: Utc };
impl<Tz: TimeZone> Date<Tz> {
/// Makes a new `Date` with given *UTC* date and offset.
/// The local date should be constructed via the `TimeZone` trait.
//
// note: this constructor is purposely not named to `new` to discourage the direct usage.
#[inline]
pub fn from_utc(date: NaiveDate, offset: Tz::Offset) -> Date<Tz> {
Date { date: date, offset: offset }
}
/// Makes a new `DateTime` from the current date and given `NaiveTime`.
/// The offset in the current date is preserved.
///
/// Panics on invalid datetime.
#[inline]
pub fn and_time(&self, time: NaiveTime) -> Option<DateTime<Tz>> {
let localdt = self.naive_local().and_time(time);
self.timezone().from_local_datetime(&localdt).single()
}
/// Makes a new `DateTime` from the current date, hour, minute and second.
/// The offset in the current date is preserved.
///
/// Panics on invalid hour, minute and/or second.
#[inline]
pub fn and_hms(&self, hour: u32, min: u32, sec: u32) -> DateTime<Tz> {
self.and_hms_opt(hour, min, sec).expect("invalid time")
}
/// Makes a new `DateTime` from the current date, hour, minute and second.
/// The offset in the current date is preserved.
///
/// Returns `None` on invalid hour, minute and/or second.
#[inline]
pub fn and_hms_opt(&self, hour: u32, min: u32, sec: u32) -> Option<DateTime<Tz>> {
NaiveTime::from_hms_opt(hour, min, sec).and_then(|time| self.and_time(time))
}
/// Makes a new `DateTime` from the current date, hour, minute, second and millisecond.
/// The millisecond part can exceed 1,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Panics on invalid hour, minute, second and/or millisecond.
#[inline]
pub fn and_hms_milli(&self, hour: u32, min: u32, sec: u32, milli: u32) -> DateTime<Tz> {
self.and_hms_milli_opt(hour, min, sec, milli).expect("invalid time")
}
/// Makes a new `DateTime` from the current date, hour, minute, second and millisecond.
/// The millisecond part can exceed 1,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Returns `None` on invalid hour, minute, second and/or millisecond.
#[inline]
pub fn and_hms_milli_opt(
&self,
hour: u32,
min: u32,
sec: u32,
milli: u32,
) -> Option<DateTime<Tz>> {
NaiveTime::from_hms_milli_opt(hour, min, sec, milli).and_then(|time| self.and_time(time))
}
/// Makes a new `DateTime` from the current date, hour, minute, second and microsecond.
/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Panics on invalid hour, minute, second and/or microsecond.
#[inline]
pub fn and_hms_micro(&self, hour: u32, min: u32, sec: u32, micro: u32) -> DateTime<Tz> {
self.and_hms_micro_opt(hour, min, sec, micro).expect("invalid time")
}
/// Makes a new `DateTime` from the current date, hour, minute, second and microsecond.
/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Returns `None` on invalid hour, minute, second and/or microsecond.
#[inline]
pub fn and_hms_micro_opt(
&self,
hour: u32,
min: u32,
sec: u32,
micro: u32,
) -> Option<DateTime<Tz>> {
NaiveTime::from_hms_micro_opt(hour, min, sec, micro).and_then(|time| self.and_time(time))
}
/// Makes a new `DateTime` from the current date, hour, minute, second and nanosecond.
/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Panics on invalid hour, minute, second and/or nanosecond.
#[inline]
pub fn and_hms_nano(&self, hour: u32, min: u32, sec: u32, nano: u32) -> DateTime<Tz> {
self.and_hms_nano_opt(hour, min, sec, nano).expect("invalid time")
}
/// Makes a new `DateTime` from the current date, hour, minute, second and nanosecond.
/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Returns `None` on invalid hour, minute, second and/or nanosecond.
#[inline]
pub fn and_hms_nano_opt(
&self,
hour: u32,
min: u32,
sec: u32,
nano: u32,
) -> Option<DateTime<Tz>> {
NaiveTime::from_hms_nano_opt(hour, min, sec, nano).and_then(|time| self.and_time(time))
}
/// Makes a new `Date` for the next date.
///
/// Panics when `self` is the last representable date.
#[inline]
pub fn succ(&self) -> Date<Tz> {
self.succ_opt().expect("out of bound")
}
/// Makes a new `Date` for the next date.
///
/// Returns `None` when `self` is the last representable date.
#[inline]
pub fn succ_opt(&self) -> Option<Date<Tz>> {
self.date.succ_opt().map(|date| Date::from_utc(date, self.offset.clone()))
}
/// Makes a new `Date` for the prior date.
///
/// Panics when `self` is the first representable date.
#[inline]
pub fn pred(&self) -> Date<Tz> {
self.pred_opt().expect("out of bound")
}
/// Makes a new `Date` for the prior date.
///
/// Returns `None` when `self` is the first representable date.
#[inline]
pub fn pred_opt(&self) -> Option<Date<Tz>> {
self.date.pred_opt().map(|date| Date::from_utc(date, self.offset.clone()))
}
/// Retrieves an associated offset from UTC.
#[inline]
pub fn offset(&self) -> &Tz::Offset {
&self.offset
}
/// Retrieves an associated time zone.
#[inline]
pub fn timezone(&self) -> Tz {
TimeZone::from_offset(&self.offset)
}
/// Changes the associated time zone.
/// This does not change the actual `Date` (but will change the string representation).
#[inline]
pub fn with_timezone<Tz2: TimeZone>(&self, tz: &Tz2) -> Date<Tz2> {
tz.from_utc_date(&self.date)
}
/// Adds given `Duration` to the current date.
///
/// Returns `None` when it will result in overflow.
#[inline]
pub fn checked_add_signed(self, rhs: OldDuration) -> Option<Date<Tz>> {
let date = try_opt!(self.date.checked_add_signed(rhs));
Some(Date { date: date, offset: self.offset })
}
/// Subtracts given `Duration` from the current date.
///
/// Returns `None` when it will result in overflow.
#[inline]
pub fn checked_sub_signed(self, rhs: OldDuration) -> Option<Date<Tz>> {
let date = try_opt!(self.date.checked_sub_signed(rhs));
Some(Date { date: date, offset: self.offset })
}
/// Subtracts another `Date` from the current date.
/// Returns a `Duration` of integral numbers.
///
/// This does not overflow or underflow at all,
/// as all possible output fits in the range of `Duration`.
#[inline]
pub fn signed_duration_since<Tz2: TimeZone>(self, rhs: Date<Tz2>) -> OldDuration {
self.date.signed_duration_since(rhs.date)
}
/// Returns a view to the naive UTC date.
#[inline]
pub fn naive_utc(&self) -> NaiveDate {
self.date
}
/// Returns a view to the naive local date.
///
/// This is technically the same as [`naive_utc`](#method.naive_utc)
/// because the offset is restricted to never exceed one day,
/// but provided for the consistency.
#[inline]
pub fn naive_local(&self) -> NaiveDate {
self.date
}
}
/// Maps the local date to other date with given conversion function.
fn map_local<Tz: TimeZone, F>(d: &Date<Tz>, mut f: F) -> Option<Date<Tz>>
where
F: FnMut(NaiveDate) -> Option<NaiveDate>,
{
f(d.naive_local()).and_then(|date| d.timezone().from_local_date(&date).single())
}
impl<Tz: TimeZone> Date<Tz>
where
Tz::Offset: fmt::Display,
{
/// Formats the date with the specified formatting items.
#[cfg(any(feature = "alloc", feature = "std", test))]
#[inline]
pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
where
I: Iterator<Item = B> + Clone,
B: Borrow<Item<'a>>,
{
DelayedFormat::new_with_offset(Some(self.naive_local()), None, &self.offset, items)
}
/// Formats the date with the specified format string.
/// See the [`format::strftime` module](./format/strftime/index.html)
/// on the supported escape sequences.
#[cfg(any(feature = "alloc", feature = "std", test))]
#[inline]
pub fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>> {
self.format_with_items(StrftimeItems::new(fmt))
}
/// Formats the date with the specified formatting items and locale.
#[cfg(feature = "unstable-locales")]
#[inline]
pub fn format_localized_with_items<'a, I, B>(
&self,
items: I,
locale: Locale,
) -> DelayedFormat<I>
where
I: Iterator<Item = B> + Clone,
B: Borrow<Item<'a>>,
{
DelayedFormat::new_with_offset_and_locale(
Some(self.naive_local()),
None,
&self.offset,
items,
locale,
)
}
/// Formats the date with the specified format string and locale.
/// See the [`format::strftime` module](./format/strftime/index.html)
/// on the supported escape sequences.
#[cfg(feature = "unstable-locales")]
#[inline]
pub fn format_localized<'a>(
&self,
fmt: &'a str,
locale: Locale,
) -> DelayedFormat<StrftimeItems<'a>> {
self.format_localized_with_items(StrftimeItems::new_with_locale(fmt, locale), locale)
}
}
impl<Tz: TimeZone> Datelike for Date<Tz> {
#[inline]
fn year(&self) -> i32 {
self.naive_local().year()
}
#[inline]
fn month(&self) -> u32 {
self.naive_local().month()
}
#[inline]
fn month0(&self) -> u32 {
self.naive_local().month0()
}
#[inline]
fn day(&self) -> u32 {
self.naive_local().day()
}
#[inline]
fn day0(&self) -> u32 {
self.naive_local().day0()
}
#[inline]
fn ordinal(&self) -> u32 {
self.naive_local().ordinal()
}
#[inline]
fn ordinal0(&self) -> u32 {
self.naive_local().ordinal0()
}
#[inline]
fn weekday(&self) -> Weekday {
self.naive_local().weekday()
}
#[inline]
fn iso_week(&self) -> IsoWeek {
self.naive_local().iso_week()
}
#[inline]
fn with_year(&self, year: i32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_year(year))
}
#[inline]
fn with_month(&self, month: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_month(month))
}
#[inline]
fn with_month0(&self, month0: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_month0(month0))
}
#[inline]
fn with_day(&self, day: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_day(day))
}
#[inline]
fn with_day0(&self, day0: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_day0(day0))
}
#[inline]
fn with_ordinal(&self, ordinal: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_ordinal(ordinal))
}
#[inline]
fn with_ordinal0(&self, ordinal0: u32) -> Option<Date<Tz>> {
map_local(self, |date| date.with_ordinal0(ordinal0))
}
}
// we need them as automatic impls cannot handle associated types
impl<Tz: TimeZone> Copy for Date<Tz> where <Tz as TimeZone>::Offset: Copy {}
unsafe impl<Tz: TimeZone> Send for Date<Tz> where <Tz as TimeZone>::Offset: Send {}
impl<Tz: TimeZone, Tz2: TimeZone> PartialEq<Date<Tz2>> for Date<Tz> {
fn eq(&self, other: &Date<Tz2>) -> bool {
self.date == other.date
}
}
impl<Tz: TimeZone> Eq for Date<Tz> {}
impl<Tz: TimeZone> PartialOrd for Date<Tz> {
fn partial_cmp(&self, other: &Date<Tz>) -> Option<Ordering> {
self.date.partial_cmp(&other.date)
}
}
impl<Tz: TimeZone> Ord for Date<Tz> {
fn cmp(&self, other: &Date<Tz>) -> Ordering {
self.date.cmp(&other.date)
}
}
impl<Tz: TimeZone> hash::Hash for Date<Tz> {
fn hash<H: hash::Hasher>(&self, state: &mut H) {
self.date.hash(state)
}
}
impl<Tz: TimeZone> Add<OldDuration> for Date<Tz> {
type Output = Date<Tz>;
#[inline]
fn add(self, rhs: OldDuration) -> Date<Tz> {
self.checked_add_signed(rhs).expect("`Date + Duration` overflowed")
}
}
impl<Tz: TimeZone> Sub<OldDuration> for Date<Tz> {
type Output = Date<Tz>;
#[inline]
fn sub(self, rhs: OldDuration) -> Date<Tz> {
self.checked_sub_signed(rhs).expect("`Date - Duration` overflowed")
}
}
impl<Tz: TimeZone> Sub<Date<Tz>> for Date<Tz> {
type Output = OldDuration;
#[inline]
fn sub(self, rhs: Date<Tz>) -> OldDuration {
self.signed_duration_since(rhs)
}
}
impl<Tz: TimeZone> fmt::Debug for Date<Tz> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}{:?}", self.naive_local(), self.offset)
}
}
impl<Tz: TimeZone> fmt::Display for Date<Tz>
where
Tz::Offset: fmt::Display,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}{}", self.naive_local(), self.offset)
}
}