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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 Error; use Spanable; use Formatable; use Parsable; use Span; use NaiveDateTimeSpan; use chrono::offset::{Local, Utc, FixedOffset}; use chrono::format::{DelayedFormat, StrftimeItems}; use chrono::{ParseResult, DateTime, TimeZone, Duration}; use std; impl<T: TimeZone> Spanable for DateTime<T> where <T as TimeZone>::Offset: std::marker::Copy { #[inline] fn signed_duration_since(self, other: Self) -> Duration { DateTime::signed_duration_since(self, other) } } impl<T: TimeZone> Formatable for DateTime<T> where <T as TimeZone>::Offset: std::fmt::Display { #[inline] fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>> { DateTime::format(self, fmt) } } impl Parsable for DateTime<Local> { #[inline] fn parse_from_str(s: &str, fmt: &str) -> ParseResult<DateTime<Local>> { Local.datetime_from_str(s, fmt) } } impl Parsable for DateTime<Utc> { #[inline] fn parse_from_str(s: &str, fmt: &str) -> ParseResult<DateTime<Utc>> { Utc.datetime_from_str(s, fmt) } } impl Parsable for DateTime<FixedOffset> { #[inline] fn parse_from_str(s: &str, fmt: &str) -> ParseResult<DateTime<FixedOffset>> { DateTime::parse_from_str(s, fmt) } } /// The `DateTimeSpan` alias is a span consisting of `chrono::DateTime`s. /// /// It can be used to represent datetime spans that depend on a specific time zone. /// /// The `DateTimeSpan` can be formatted and parsed from a string. It can be used for serialization /// and deserialization with `serde`. The deserialization is currently only supported for the /// `Utc`, `Local` and `FixedOffset` time zones. The time zones provided by `chrono-tz` do not /// implement `from_str` and `parse_from_str` for `chrono::DateTime<Tz>` and can therefore not be /// deserialized. /// /// # Example /// /// ~~~~ /// # extern crate timespan; extern crate chrono; fn main() { /// use timespan::DateTimeSpan; /// use chrono::Utc; /// /// let a: DateTimeSpan<Utc> = "2017-01-01T15:10:00 +0200 - 2017-01-02T09:30:00 +0200" /// .parse().unwrap(); /// /// assert!( /// format!("{}", a.format("{start} to {end}", "%c", "%c")) == /// "Sun Jan 1 13:10:00 2017 to Mon Jan 2 07:30:00 2017" /// ); /// # } /// ~~~~ pub type DateTimeSpan<T> = Span<DateTime<T>>; impl<T: TimeZone> DateTimeSpan<T> { /// Create a `DateTimeSpan` from a `NaiveDateTimeSpan` with the time zone set to the local time zone. /// /// Currently the result handling of the internally used `TimeZone::from_local_datetime` 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_datetimespan` should be prefered. pub fn from_local_datetimespan(span: &NaiveDateTimeSpan, tz: &T) -> Result<Self, Error> { Ok(DateTimeSpan { start: tz.from_local_datetime(&span.start).single().ok_or(Error::LocalAmbigious)?, end: tz.from_local_datetime(&span.end).single().ok_or(Error::LocalAmbigious)?, }) } /// Create a `DateTimeSpan` from a `NaiveDateTimeSpan` with the time zone set to UTC. /// /// # Example /// /// ~~~~ /// # extern crate timespan; extern crate chrono_tz; fn main() { /// use timespan::DateTimeSpan; /// use chrono_tz::America::Puerto_Rico; /// /// let a = DateTimeSpan::from_utc_datetimespan( /// &"2017-03-12T12:00:00 - 2017-03-15T14:00:00".parse().unwrap(), /// &Puerto_Rico, /// ); /// /// assert!(format!("{}", a) == "2017-03-12 08:00:00 AST - 2017-03-15 10:00:00 AST"); /// # } /// ~~~~ pub fn from_utc_datetimespan(span: &NaiveDateTimeSpan, tz: &T) -> Self { DateTimeSpan { start: tz.from_utc_datetime(&span.start), end: tz.from_utc_datetime(&span.end), } } }