Expand description

Chrono-TZ

Chrono-TZ is a library that provides implementors of the TimeZone trait for chrono. The impls are generated by a build script using the IANA database and zoneinfo_parse.

Examples

Create a time in one timezone and convert it to UTC

use chrono::{TimeZone, Utc};
use chrono_tz::US::Pacific;

let pacific_time = Pacific.ymd(1990, 5, 6).and_hms(12, 30, 45);
let utc_time = pacific_time.with_timezone(&Utc);
assert_eq!(utc_time, Utc.ymd(1990, 5, 6).and_hms(19, 30, 45));

Create a naive datetime and convert it to a timezone-aware datetime

use chrono::{TimeZone, NaiveDate};
use chrono_tz::Africa::Johannesburg;

let naive_dt = NaiveDate::from_ymd(2038, 1, 19).and_hms(3, 14, 08);
let tz_aware = Johannesburg.from_local_datetime(&naive_dt).unwrap();
assert_eq!(tz_aware.to_string(), "2038-01-19 03:14:08 SAST");

London and New York change their clocks on different days in March so only have a 4-hour difference on certain days.

use chrono::TimeZone;
use chrono_tz::Europe::London;
use chrono_tz::America::New_York;

let london_time = London.ymd(2016, 3, 18).and_hms(3, 0, 0);
let ny_time = london_time.with_timezone(&New_York);
assert_eq!(ny_time, New_York.ymd(2016, 3, 17).and_hms(23, 0, 0));

Adding 24 hours across a daylight savings change causes a change in local time

use chrono::{TimeZone, Duration};
use chrono_tz::Europe::London;

let dt = London.ymd(2016, 10, 29).and_hms(12, 0, 0);
let later = dt + Duration::hours(24);
assert_eq!(later, London.ymd(2016, 10, 30).and_hms(11, 0, 0));

And of course you can always convert a local time to a unix timestamp

use chrono::TimeZone;
use chrono_tz::Asia::Kolkata;

let dt = Kolkata.ymd(2000, 1, 1).and_hms(0, 0, 0);
let timestamp = dt.timestamp();
assert_eq!(timestamp, 946665000);

Pretty-printing a string will use the correct abbreviation for the timezone

use chrono::TimeZone;
use chrono_tz::Europe::London;

let dt = London.ymd(2016, 5, 10).and_hms(12, 0, 0);
assert_eq!(dt.to_string(), "2016-05-10 12:00:00 BST");
assert_eq!(dt.to_rfc3339(), "2016-05-10T12:00:00+01:00");

You can convert a timezone string to a timezone using the FromStr trait

use chrono::TimeZone;
use chrono_tz::Tz;
use chrono_tz::UTC;

let tz: Tz = "Antarctica/South_Pole".parse().unwrap();
let dt = tz.ymd(2016, 10, 22).and_hms(12, 0, 0);
let utc = dt.with_timezone(&UTC);
assert_eq!(utc.to_string(), "2016-10-21 23:00:00 UTC");

If you need to iterate over all variants you can use the TZ_VARIANTS array

use chrono_tz::{TZ_VARIANTS, Tz};
assert!(TZ_VARIANTS.iter().any(|v| *v == Tz::UTC));

Modules

Enums

TimeZones built at compile time from the tz database

Constants

Statics

An array of every known variant

Traits

Detailed timezone offset components that expose any special conditions currently in effect.
Timezone offset name information.

Type Definitions