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// timespan - A simple timespan for chrono times. // // Copyright (C) 2017 // Fin Christensen <christensen.fin@gmail.com> // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. use crate::Error; use crate::Formatable; use crate::NaiveDateSpan; use crate::Span; use crate::Spanable; use chrono::format::{DelayedFormat, StrftimeItems}; use chrono::{Date, Duration, TimeZone}; use std; impl<T: TimeZone> Spanable for Date<T> where <T as TimeZone>::Offset: std::marker::Copy, { #[inline] fn signed_duration_since(self, other: Self) -> Duration { Date::signed_duration_since(self, other) } } impl<T: TimeZone> Formatable for Date<T> where <T as TimeZone>::Offset: std::fmt::Display, { #[inline] fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>> { Date::format(self, fmt) } } /// The `DateSpan` alias is a span consisting of `chrono::Date`s. /// /// It can be used to represent date spans that depend on a specific time zone. /// /// The `DateSpan` can be formatted to a string. It can only be used for serialization /// when using `serde` as deserialization is not supported. /// /// # Example /// /// ~~~~ /// # extern crate timespan; extern crate chrono_tz; fn main() { /// use timespan::DateSpan; /// use chrono_tz::Europe::Paris; /// /// let a = DateSpan::from_utc_datespan( /// &"1789-06-17 - 1799-11-10".parse().unwrap(), /// &Paris, /// ); /// /// let f = a.format( /// "The french revolution lasted from the {start} to the {end}.", /// "%eth of %B %Y", /// "%eth of %B %Y", /// ); /// assert!( /// format!("{}", f) == /// "The french revolution lasted from the 17th of June 1789 to the 10th of November 1799." /// ); /// # } /// ~~~~ pub type DateSpan<T> = Span<Date<T>>; impl<T: TimeZone> DateSpan<T> { /// Create a `DateSpan` from a `NaiveDateSpan` with the time zone set to the local time zone. /// /// Currently the result handling of the internally used `TimeZone::from_local_date` is not /// implemented properly. Therefore only date spans with a single local time zone can be created. /// Ambigious local time zones will lead to `Error::LocalAmbigious`. /// /// To avoid this `from_utc_datespan` should be prefered. pub fn from_local_datespan(span: &NaiveDateSpan, tz: &T) -> Result<Self, Error> { Ok(DateSpan { start: tz .from_local_date(&span.start) .single() .ok_or(Error::LocalAmbigious)?, end: tz .from_local_date(&span.end) .single() .ok_or(Error::LocalAmbigious)?, }) } /// Create a `DateSpan` from a `NaiveDateSpan` with the time zone set to UTC. /// /// As a `DateSpan` cannot be parsed from a string this method is the preferred way of creating /// a `DateSpan`. /// /// # Example /// /// ~~~~ /// # extern crate timespan; extern crate chrono_tz; fn main() { /// use timespan::DateSpan; /// use chrono_tz::Europe::Berlin; /// /// let a = DateSpan::from_utc_datespan( /// &"2017-05-21 - 2017-05-27".parse().unwrap(), /// &Berlin, /// ); /// /// assert!(format!("{}", a) == "2017-05-21CEST - 2017-05-27CEST"); /// # } /// ~~~~ pub fn from_utc_datespan(span: &NaiveDateSpan, tz: &T) -> Self { DateSpan { start: tz.from_utc_date(&span.start), end: tz.from_utc_date(&span.end), } } }