a0-tzmigration-js

This NPM package provides utilities to help with migrations between timezone changes. Please check the official webpage for documentation: https://a0.github.io/a0-tzmigration/

Installation

Using npm:

npm -i a0-tzmigration-js

Usage

import { TZVersion } from 'a0-tzmigration-js'
 
// calculate changes from America/Santiago 2015a to America/Punta_Arenas 2017a
let version_a = TZVersion.new('America/Santiago', '2015a')
let version_b = TZVersion.new('America/Punta_Arenas', '2017a')
 
version_a.changes(version_b).then(changes => {
  console.log(changes)
/* =>
  [{ ini_str: "-∞", fin_str: "1890-01-01 04:43:40 UTC", off_str: "-00:00:54", ini: -Infinity, fin: -2524504580, off: -54 },
   { ini_str: "1910-01-01 04:42:46 UTC", fin_str: "1910-01-10 04:42:46 UTC", off_str: "+00:17:14", ini: -1893439034, fin: -1892661434, off: 1034 },
   { ini_str: "1918-09-01 04:42:46 UTC", fin_str: "1918-09-10 04:42:46 UTC", off_str: "-00:42:46", ini: -1619983034, fin: -1619205434, off: -2566 },
   { ini_str: "1946-09-01 03:00:00 UTC", fin_str: "1947-04-01 04:00:00 UTC", off_str: "+01:00:00", ini: -736376400, fin: -718056000, off: 3600 },
   { ini_str: "1947-05-22 04:00:00 UTC", fin_str: "1947-05-22 05:00:00 UTC", off_str: "+01:00:00", ini: -713649600, fin: -713646000, off: 3600 },
   { ini_str: "1988-10-02 04:00:00 UTC", fin_str: "1988-10-09 04:00:00 UTC", off_str: "-01:00:00", ini: 591768000, fin: 592372800, off: -3600 },
   { ini_str: "1990-03-11 03:00:00 UTC", fin_str: "1990-03-18 03:00:00 UTC", off_str: "-01:00:00", ini: 637124400, fin: 637729200, off: -3600 },
   { ini_str: "2016-05-15 03:00:00 UTC", fin_str: "2016-08-14 04:00:00 UTC", off_str: "-01:00:00", ini: 1463281200, fin: 1471147200, off: -3600 }]
 */
})
 
// get current known versions in the repository
TZVersion.versions().then(versions => {
  console.log(versions)
/* =>
  { "2013c":
    { "released_at": "2013-04-19 16:17:40 -0700",
      "timezones": [
        "Africa/Abidjan",
        "Africa/Accra",
        "Africa/Addis_Ababa",
        "Africa/Algiers",
        "Africa/Asmara",
        …
 */
})
 
// get current known timezones in the repository
TZVersion.timezones().then(transitions => {
  console.log(timezones)
/* =>
  { "Africa/Abidjan":
    { "versions": [
        "2013c",
        "2013d",
        "2013e",
        "2013f",
        "2013g",
        …
 */
})

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/a0/a0-tzmigration-js. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The package is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the a0-tzmigration project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.