added `chrono::format` module and `format` methods.
this is a saner replacement for `time::strftime`; it does not allocate the additional memory.
This commit is contained in:
Kang Seonghoon
parent
ed71a1037b
commit
f1931ad21e
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@ -15,6 +15,7 @@ use naive;
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use naive::date::NaiveDate;
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use naive::time::NaiveTime;
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use datetime::DateTime;
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use format::DelayedFormat;
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/// ISO 8601 calendar date with timezone.
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#[deriving(Clone)]
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@ -158,6 +159,13 @@ impl<Off:Offset> Date<Off> {
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self.date.pred_opt().map(|date| Date::from_utc(date, self.offset.clone()))
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}
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/// Formats the date in the specified format string.
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/// See the `format` module on the supported escape sequences.
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#[inline]
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pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
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DelayedFormat::new_with_offset(Some(self.local()), None, &self.offset, fmt)
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}
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/// Returns a view to the local date.
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fn local(&self) -> NaiveDate {
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self.offset.to_local_date(&self.date)
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@ -14,6 +14,7 @@ use duration::Duration;
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use naive::datetime::NaiveDateTime;
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use time::Time;
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use date::Date;
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use format::DelayedFormat;
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/// ISO 8601 combined date and time with timezone.
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#[deriving(Clone)]
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@ -48,6 +49,14 @@ impl<Off:Offset> DateTime<Off> {
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self.datetime.num_seconds_from_unix_epoch()
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}
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/// Formats the combined date and time in the specified format string.
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/// See the `format` module on the supported escape sequences.
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#[inline]
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pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
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let local = self.local();
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DelayedFormat::new_with_offset(Some(local.date()), Some(local.time()), &self.offset, fmt)
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}
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/// Returns a view to the local datetime.
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fn local(&self) -> NaiveDateTime {
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self.offset.to_local_datetime(&self.datetime)
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@ -0,0 +1,215 @@
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// This is a part of rust-chrono.
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// Copyright (c) 2014, Kang Seonghoon.
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// See README.md and LICENSE.txt for details.
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/*!
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* Formatting utilities for date and time.
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*/
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use std::fmt;
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use std::str::MaybeOwned;
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use std::io::{IoResult, IoError, InvalidInput};
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use {Datelike, Timelike};
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use duration::Duration;
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use offset::Offset;
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use naive::date::NaiveDate;
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use naive::time::NaiveTime;
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/// The internal workhouse for `DelayedFormat`.
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fn format(w: &mut Writer, date: Option<&NaiveDate>, time: Option<&NaiveTime>,
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off: Option<&(MaybeOwned<'static>, Duration)>, fmt: &str) -> IoResult<()> {
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static SHORT_MONTHS: [&'static str, ..12] =
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["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
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static LONG_MONTHS: [&'static str, ..12] =
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["January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"];
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static SHORT_WEEKDAYS: [&'static str, ..7] =
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["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
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static LONG_WEEKDAYS: [&'static str, ..7] =
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["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];
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let mut parts = fmt.split('%');
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match parts.next() {
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Some(first) => try!(write!(w, "{}", first)),
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None => return Ok(()),
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}
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let mut last_was_percent = false;
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for part in parts {
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if last_was_percent { // `%%<part>`
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last_was_percent = false;
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try!(write!(w, "%{}", part));
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continue;
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}
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let (head, tail) = part.slice_shift_char();
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match (head, date, time, off) {
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// year
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(Some('Y'), Some(d), _, _) => try!(write!(w, "{}", d.year())),
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(Some('C'), Some(d), _, _) => try!(write!(w, "{:02}", d.year() / 100)),
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(Some('y'), Some(d), _, _) => try!(write!(w, "{:02}", d.year() % 100)),
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(Some('G'), Some(d), _, _) => try!(write!(w, "{:04}", d.isoweekdate().val0())),
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(Some('g'), Some(d), _, _) => try!(write!(w, "{:02}", d.isoweekdate().val0() % 100)),
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// month
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(Some('m'), Some(d), _, _) => try!(write!(w, "{:02}", d.month())),
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(Some('b'), Some(d), _, _) | (Some('h'), Some(d), _, _) =>
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try!(write!(w, "{}", SHORT_MONTHS[d.month0() as uint])),
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(Some('B'), Some(d), _, _) =>
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try!(write!(w, "{}", LONG_MONTHS[d.month0() as uint])),
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// day of month
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(Some('d'), Some(d), _, _) => try!(write!(w, "{:02}", d.day())),
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(Some('e'), Some(d), _, _) => try!(write!(w, "{:2}", d.day())),
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// week
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(Some('U'), Some(d), _, _) =>
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try!(write!(w, "{:02}", (d.ordinal() - d.weekday().num_days_from_sunday()
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+ 7) / 7)),
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(Some('W'), Some(d), _, _) =>
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try!(write!(w, "{:02}", (d.ordinal() - d.weekday().num_days_from_monday()
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+ 7) / 7)),
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(Some('V'), Some(d), _, _) => try!(write!(w, "{:02}", d.isoweekdate().val1())),
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// day of week
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(Some('a'), Some(d), _, _) =>
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try!(write!(w, "{}", SHORT_WEEKDAYS[d.weekday().num_days_from_monday() as uint])),
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(Some('A'), Some(d), _, _) =>
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try!(write!(w, "{}", LONG_WEEKDAYS[d.weekday().num_days_from_monday() as uint])),
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(Some('w'), Some(d), _, _) => try!(write!(w, "{}", d.weekday().num_days_from_sunday())),
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(Some('u'), Some(d), _, _) => try!(write!(w, "{}", d.weekday().number_from_monday())),
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// day of year
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(Some('j'), Some(d), _, _) => try!(write!(w, "{:03}", d.ordinal())),
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// combined date
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(Some('D'), Some(d), _, _) | (Some('x'), Some(d), _, _) => // `%m/%d/%y`
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try!(write!(w, "{:02}/{:02}/{:02}", d.month(), d.day(), d.year() % 100)),
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(Some('F'), Some(d), _, _) => // `%Y-%m-%d'
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try!(write!(w, "{:04}-{:02}-{:02}", d.year(), d.month(), d.day())),
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(Some('v'), Some(d), _, _) => // `%e-%b-%Y'
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try!(write!(w, "{:2}-{}-{:04}", d.day(), SHORT_MONTHS[d.month0() as uint],
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d.year())),
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// hour
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(Some('H'), _, Some(t), _) => try!(write!(w, "{:02}", t.hour())),
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(Some('k'), _, Some(t), _) => try!(write!(w, "{:2}", t.hour())),
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(Some('I'), _, Some(t), _) => try!(write!(w, "{:02}", t.hour12().val1())),
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(Some('l'), _, Some(t), _) => try!(write!(w, "{:2}", t.hour12().val1())),
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(Some('P'), _, Some(t), _) =>
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try!(write!(w, "{}", if t.hour12().val0() {"pm"} else {"am"})),
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(Some('p'), _, Some(t), _) =>
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try!(write!(w, "{}", if t.hour12().val0() {"PM"} else {"AM"})),
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// minute
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(Some('M'), _, Some(t), _) => try!(write!(w, "{:02}", t.minute())),
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// second and below
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(Some('S'), _, Some(t), _) => try!(write!(w, "{:02}", t.second())),
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(Some('f'), _, Some(t), _) => try!(write!(w, "{:09}", t.nanosecond())),
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// combined time
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(Some('R'), _, Some(t), _) => // `%H:%M`
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try!(write!(w, "{:02}:{:02}", t.hour(), t.minute())),
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(Some('T'), _, Some(t), _) | (Some('X'), _, Some(t), _) => // `%H:%M:%S`
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try!(write!(w, "{:02}:{:02}:{:02}", t.hour(), t.minute(), t.second())),
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(Some('r'), _, Some(t), _) => { // `%I:%M:%S %p`
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let (is_pm, hour12) = t.hour12();
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try!(write!(w, "{:02}:{:02}:{:02} {}", hour12, t.minute(), t.second(),
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if is_pm {"PM"} else {"AM"}))
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},
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// timezone
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(Some('Z'), _, _, Some(&(ref name, _))) => try!(write!(w, "{}", *name)),
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(Some('z'), _, _, Some(&(_, ref local_minus_utc))) => {
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let off = local_minus_utc.num_minutes();
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let (sign, off) = if off < 0 {('-', -off)} else {('+', off)};
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try!(write!(w, "{}{:02}{:02}", sign, off / 60, off % 60))
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},
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/*
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// timestamp
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(Some('s'), Some(d), Some(t), Some(o)) => { // XXX
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let datetime = o.from_local_datetime(&d.and_time(t.clone())).unwrap();
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try!(write!(w, "{}", datetime.num_seconds_from_unix_epoch()))
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},
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*/
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// combined date and time
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(Some('c'), Some(d), Some(t), _) => // `%a %b %e %T %Y`
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try!(write!(w, "{} {} {:2} {:02}:{:02}:{:02} {:04}",
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SHORT_WEEKDAYS[d.weekday().num_days_from_monday() as uint],
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SHORT_MONTHS[d.month0() as uint], d.day(),
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t.hour(), t.minute(), t.second(), d.year())),
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(Some('+'), Some(d), Some(t),
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Some(&(_, ref local_minus_utc))) => { // `%Y-%m-%dT%H:%M:%S` plus tz
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let off = local_minus_utc.num_minutes();
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let (sign, off) = if off < 0 {('-', -off)} else {('+', off)};
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try!(write!(w, "{}-{:02}-{:02}T{:02}:{:02}:{:02}{}{:02}:{:02}",
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d.year(), d.month(), d.day(), t.hour(), t.minute(), t.second(),
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sign, off / 60, off % 60))
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},
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// special characters
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(Some('t'), _, _, _) => try!(write!(w, "\t")),
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(Some('n'), _, _, _) => try!(write!(w, "\n")),
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(Some(c), _, _, _) => {
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return Err(IoError { kind: InvalidInput, desc: "invalid date/time format",
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detail: Some(format!("unsupported escape sequence %{}", c)) });
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}
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(None, _, _, _) => {
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// if there is the next part, a single `%` and that part should be printed
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// in verbatim. otherwise it is an error (the stray `%`).
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last_was_percent = true;
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}
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}
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try!(write!(w, "{}", tail));
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}
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if last_was_percent { // a stray `%`
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Err(IoError { kind: InvalidInput,
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desc: "invalid date/time format: stray `%`", detail: None })
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} else {
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Ok(())
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}
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}
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/// A *temporary* object which can be used as an argument to `format!` or others.
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/// This is normally constructed via `format` methods of each date and time type.
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pub struct DelayedFormat<'a> {
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/// The date view, if any.
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date: Option<NaiveDate>,
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/// The time view, if any.
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time: Option<NaiveTime>,
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/// The name and local-to-UTC difference for the offset (timezone), if any.
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off: Option<(MaybeOwned<'static>, Duration)>,
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/// The format string.
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fmt: &'a str,
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}
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impl<'a> DelayedFormat<'a> {
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/// Makes a new `DelayedFormat` value out of local date and time.
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pub fn new(date: Option<NaiveDate>, time: Option<NaiveTime>,
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fmt: &'a str) -> DelayedFormat<'a> {
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DelayedFormat { date: date, time: time, off: None, fmt: fmt }
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}
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/// Makes a new `DelayedFormat` value out of local date and time and UTC offset.
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pub fn new_with_offset<Off:Offset>(date: Option<NaiveDate>, time: Option<NaiveTime>,
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offset: &Off, fmt: &'a str) -> DelayedFormat<'a> {
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let name_and_diff = (offset.name(), offset.local_minus_utc());
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DelayedFormat { date: date, time: time, off: Some(name_and_diff), fmt: fmt }
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}
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}
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impl<'a> fmt::Show for DelayedFormat<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let ret = format(f, self.date.as_ref(), self.time.as_ref(), self.off.as_ref(), self.fmt);
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ret.map_err(|_| fmt::WriteError) // XXX
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}
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}
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@ -39,6 +39,7 @@ pub mod naive {
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pub mod date;
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pub mod time;
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pub mod datetime;
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pub mod format;
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/// The day of week (DOW).
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///
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@ -13,6 +13,7 @@ use {Weekday, Datelike};
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use duration::Duration;
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use naive::time::NaiveTime;
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use naive::datetime::NaiveDateTime;
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use format::DelayedFormat;
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use self::internals::{DateImpl, Of, Mdf, YearFlags};
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@ -296,6 +297,13 @@ impl NaiveDate {
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pub fn pred_opt(&self) -> Option<NaiveDate> {
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self.with_of(self.of().pred()).or_else(|| NaiveDate::from_ymd_opt(self.year() - 1, 12, 31))
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}
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/// Formats the date in the specified format string.
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/// See the `format` module on the supported escape sequences.
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#[inline]
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pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
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DelayedFormat::new(Some(self.clone()), None, fmt)
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}
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}
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impl Datelike for NaiveDate {
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@ -736,6 +744,27 @@ mod tests {
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assert_eq!(format!("{:+30}", NaiveDate::from_ymd(1234, 5, 6)), "1234-05-06".to_string());
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assert_eq!(format!("{:30}", NaiveDate::from_ymd(12345, 6, 7)), "+12345-06-07".to_string());
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}
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#[test]
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fn test_date_format() {
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let d = NaiveDate::from_ymd(2012, 3, 4);
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assert_eq!(d.format("%Y,%C,%y,%G,%g").to_string(), "2012,20,12,2012,12".to_string());
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assert_eq!(d.format("%m,%b,%h,%B").to_string(), "03,Mar,Mar,March".to_string());
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assert_eq!(d.format("%d,%e").to_string(), "04, 4".to_string());
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assert_eq!(d.format("%U,%W,%V").to_string(), "10,09,09".to_string());
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assert_eq!(d.format("%a,%A,%w,%u").to_string(), "Sun,Sunday,0,7".to_string());
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assert_eq!(d.format("%j").to_string(), "064".to_string()); // since 2012 is a leap year
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assert_eq!(d.format("%D,%x").to_string(), "03/04/12,03/04/12".to_string());
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assert_eq!(d.format("%F").to_string(), "2012-03-04".to_string());
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assert_eq!(d.format("%v").to_string(), " 4-Mar-2012".to_string());
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assert_eq!(d.format("%t%n%%%n%t").to_string(), "\t\n%\n\t".to_string());
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// corner cases
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assert_eq!(NaiveDate::from_ymd(2007, 12, 31).format("%G,%g,%U,%W,%V").to_string(),
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"2008,08,53,53,01".to_string());
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assert_eq!(NaiveDate::from_ymd(2010, 1, 3).format("%G,%g,%U,%W,%V").to_string(),
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"2009,09,01,00,53".to_string());
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}
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}
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/**
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@ -13,6 +13,7 @@ use {Weekday, Timelike, Datelike};
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use duration::Duration;
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use naive::time::NaiveTime;
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use naive::date::NaiveDate;
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use format::DelayedFormat;
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/// ISO 8601 combined date and time without timezone.
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#[deriving(PartialEq, Eq, PartialOrd, Ord, Clone, Hash)]
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@ -77,6 +78,13 @@ impl NaiveDateTime {
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let nseconds = self.time.num_seconds_from_midnight() as i64;
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(ndays - 719163) * 86400 + nseconds
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}
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/// Formats the combined date and time in the specified format string.
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/// See the `format` module on the supported escape sequences.
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#[inline]
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pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
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DelayedFormat::new(Some(self.date.clone()), Some(self.time.clone()), fmt)
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}
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}
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impl Datelike for NaiveDateTime {
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@ -247,5 +255,12 @@ mod tests {
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assert_eq!(to_timestamp(2001, 9, 9, 1, 46, 40), 1_000_000_000);
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assert_eq!(to_timestamp(2038, 1, 19, 3, 14, 7), 0x7fffffff);
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}
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#[test]
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fn test_datetime_format() {
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let dt = NaiveDate::from_ymd(2010, 9, 8).and_hms_milli(7, 6, 54, 321);
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assert_eq!(dt.format("%c").to_string(), "Wed Sep 8 07:06:54 2010".to_string());
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assert_eq!(dt.format("%t%n%%%n%t").to_string(), "\t\n%\n\t".to_string());
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}
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}
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@ -12,6 +12,7 @@ use num::Integer;
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use Timelike;
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use offset::Offset;
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use duration::Duration;
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use format::DelayedFormat;
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/// ISO 8601 time without timezone.
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/// Allows for the nanosecond precision and optional leap second representation.
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@ -115,6 +116,13 @@ impl NaiveTime {
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Some(NaiveTime { secs: secs, frac: nano })
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}
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/// Formats the time in the specified format string.
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/// See the `format` module on the supported escape sequences.
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#[inline]
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pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
|
||||
DelayedFormat::new(None, Some(self.clone()), fmt)
|
||||
}
|
||||
|
||||
/// Returns a triple of the hour, minute and second numbers.
|
||||
fn hms(&self) -> (u32, u32, u32) {
|
||||
let (mins, sec) = self.secs.div_mod_floor(&60);
|
||||
|
|
@ -350,5 +358,21 @@ mod tests {
|
|||
assert_eq!(format!("{:30}", NaiveTime::from_hms_milli(3, 5, 7, 9)),
|
||||
"03:05:07.009".to_string());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_time_format() {
|
||||
let t = NaiveTime::from_hms_nano(3, 5, 7, 98765432);
|
||||
assert_eq!(t.format("%H,%k,%I,%l,%P,%p").to_string(), "03, 3,03, 3,am,AM".to_string());
|
||||
assert_eq!(t.format("%M").to_string(), "05".to_string());
|
||||
assert_eq!(t.format("%S,%f").to_string(), "07,098765432".to_string());
|
||||
assert_eq!(t.format("%R").to_string(), "03:05".to_string());
|
||||
assert_eq!(t.format("%T,%X").to_string(), "03:05:07,03:05:07".to_string());
|
||||
assert_eq!(t.format("%r").to_string(), "03:05:07 AM".to_string());
|
||||
assert_eq!(t.format("%t%n%%%n%t").to_string(), "\t\n%\n\t".to_string());
|
||||
|
||||
// corner cases
|
||||
assert_eq!(NaiveTime::from_hms(13, 57, 9).format("%r").to_string(),
|
||||
"01:57:09 PM".to_string());
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -7,6 +7,7 @@
|
|||
*/
|
||||
|
||||
use std::fmt;
|
||||
use std::str::MaybeOwned;
|
||||
use stdtime;
|
||||
use num::Integer;
|
||||
|
||||
|
|
@ -214,6 +215,12 @@ pub trait Offset: Clone + fmt::Show {
|
|||
}
|
||||
}
|
||||
|
||||
/// Returns a name or abbreviation of this offset.
|
||||
fn name(&self) -> MaybeOwned<'static>;
|
||||
|
||||
/// Returns the *current* offset from UTC to the local time.
|
||||
fn local_minus_utc(&self) -> Duration;
|
||||
|
||||
/// Converts the local `NaiveDate` to the timezone-aware `Date` if possible.
|
||||
fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<Self>>;
|
||||
|
||||
|
|
@ -253,6 +260,9 @@ impl UTC {
|
|||
}
|
||||
|
||||
impl Offset for UTC {
|
||||
fn name(&self) -> MaybeOwned<'static> { "UTC".into_maybe_owned() }
|
||||
fn local_minus_utc(&self) -> Duration { Duration::zero() }
|
||||
|
||||
fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<UTC>> {
|
||||
Single(Date::from_utc(local.clone(), UTC))
|
||||
}
|
||||
|
|
@ -321,6 +331,9 @@ impl FixedOffset {
|
|||
}
|
||||
|
||||
impl Offset for FixedOffset {
|
||||
fn name(&self) -> MaybeOwned<'static> { "UTC".into_maybe_owned() } // XXX
|
||||
fn local_minus_utc(&self) -> Duration { Duration::seconds(self.local_minus_utc) }
|
||||
|
||||
fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<FixedOffset>> {
|
||||
Single(Date::from_utc(local.clone(), self.clone()))
|
||||
}
|
||||
|
|
@ -410,6 +423,9 @@ impl Local {
|
|||
}
|
||||
|
||||
impl Offset for Local {
|
||||
fn name(&self) -> MaybeOwned<'static> { "LMT".into_maybe_owned() } // XXX XXX
|
||||
fn local_minus_utc(&self) -> Duration { self.cached.local_minus_utc() }
|
||||
|
||||
fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<Local>> {
|
||||
match self.from_local_datetime(&local.and_hms(0, 0, 0)) {
|
||||
NoResult => NoResult,
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@ use Timelike;
|
|||
use offset::Offset;
|
||||
use duration::Duration;
|
||||
use naive::time::NaiveTime;
|
||||
use format::DelayedFormat;
|
||||
|
||||
/// ISO 8601 time with timezone.
|
||||
#[deriving(Clone)]
|
||||
|
|
@ -28,6 +29,13 @@ impl<Off:Offset> Time<Off> {
|
|||
Time { time: time, offset: offset }
|
||||
}
|
||||
|
||||
/// Formats the time in the specified format string.
|
||||
/// See the `format` module on the supported escape sequences.
|
||||
#[inline]
|
||||
pub fn format<'a>(&'a self, fmt: &'a str) -> DelayedFormat<'a> {
|
||||
DelayedFormat::new_with_offset(None, Some(self.local()), &self.offset, fmt)
|
||||
}
|
||||
|
||||
/// Returns a view to the local time.
|
||||
fn local(&self) -> NaiveTime {
|
||||
self.offset.to_local_time(&self.time)
|
||||
|
|
|
|||
Loading…
Reference in New Issue