@sytexa/tzdb v6.46.0

Important

You probably want the original version by VVO:

• Github - https://github.com/vvo/tzdb
• NPM - https://www.npmjs.com/package/@vvo/tzdb

All credit to the original author VVO

Fork Changes

This fork moves deprecated time zone names to their own key in the time zone object, instead of grouping them with group:

{
  "name": "America/New_York",
  "alternativeName": "Eastern Time",
  "group": [
    "America/Detroit",
    "America/Indiana/Indianapolis",
    "America/Indiana/Marengo",
    "America/Indiana/Petersburg",
    "America/Indiana/Vevay",
    "America/Indiana/Vincennes",
    "America/Indiana/Winamac",
    "America/Kentucky/Louisville",
    "America/Kentucky/Monticello",
    "America/New_York"
  ],
  "deprecatedNames": [
    "US/Michigan",
    "America/Fort_Wayne",
    "America/Indianapolis",
    "US/East-Indiana",
    "America/Louisville",
    "US/Eastern"
  ],
  "continentCode": "NA",
  "continentName": "North America",
  "countryName": "United States",
  "countryCode": "US",
  "mainCities": ["New York City", "Brooklyn", "Queens", "Philadelphia"],
  "rawOffsetInMinutes": -300,
  "abbreviation": "EST",
  "rawFormat": "-05:00 Eastern Time - New York City, Brooklyn, Queens, Philadelphia"
}

Useful if you don't want or need to support the deprecated time zones...

getUngroupedTimeZones()

This fork also adds the getUngroupedTimeZones() function, which returns an array of simplified time zone objects with current time information. We prefer this for creating time zone selection boxes when deprecated time zones are not required.

[
  // ...
  {
    name: "America/Los_Angeles",
    currentTimeOffsetInMinutes: -420, // "current" time zone offset, this is why getUngroupedTimeZones() is a method and not just an object: it works at runtime
    currentTimeFormat: "(UTC -7) America/Los Angeles",
  },
  // ...
];

tzdb

This is a list and npm package of:

• "simplified" IANA time zones with their alternative names like Pacific Time instead of America/Los_Angeles, along with major cities for each time zone.
• all existing raw IANA time zones names
• "raw" offsets along with current time offsets
• also includes deprecated time zone names for compatibility

The data and npm packages are automatically updated whenever there are changes to https://www.geonames.org/ which is generated from IANA databases.

This is useful whenever you want to build a time zone select menu in your application.

NPM package

Installation:

npm add @sytexa/tzdb


Usage:

```js
import { getTimeZones, getUngroupedTimeZones, rawTimeZones, timeZonesNames } from "@sytexa/tzdb";

API

getTimeZones()

const timeZones = getTimeZones();

This method returns an array of time zones objects:

[
  // ...
  {
    name: "America/Los_Angeles",
    alternativeName: "Pacific Time",
    group: ["America/Los_Angeles"],
    deprecatedNames: [],
    continentCode: "NA",
    continentName: "North America",
    countryName: "United States",
    countryCode: "US",
    mainCities: ["Los Angeles", "San Diego", "San Jose", "San Francisco"],
    rawOffsetInMinutes: -480,
    abbreviation: "PST",
    rawFormat: "-08:00 Pacific Time - Los Angeles, San Diego, San Jose, San Francisco",
    currentTimeOffsetInMinutes: -420, // "current" time zone offset, this is why getTimeZones() is a method and not just an object: it works at runtime
    currentTimeFormat: "-07:00 Pacific Time - Los Angeles, San Diego",
  },
  // ...
];

When relevant, time zones are grouped. The rules for grouping are:

• if the time zones are in the same country
• if the DST or summer time offsets are the same
• if the non-DST, non-summer time offsets are the same
• then we group the time zones
• the "main" time zone name (name attribute), is always the one from the most populated city

Here's a grouping example:

{
  name: "America/Dawson_Creek",
  alternativeName: "Mountain Time",
  group: ["America/Creston", "America/Dawson_Creek", "America/Fort_Nelson"],
  deprecatedNames: [],
  continentCode: "NA",
  continentName: "North America",
  countryName: "Canada",
  countryCode: "CA",
  mainCities: ["Fort St. John", "Creston", "Fort Nelson"],
  rawOffsetInMinutes: -420,
  abbreviation: "MST",
  rawFormat: "-07:00 Mountain Time - Fort St. John, Creston, Fort Nelson",
  currentTimeOffsetInMinutes: -420,
  currentTimeFormat: "-07:00 Mountain Time - Fort St. John, Creston"
}

rawTimeZones

This is an array of time zone objects without the current time information:

[
  // ...
  {
    name: "America/Los_Angeles",
    alternativeName: "Pacific Time",
    group: ["America/Los_Angeles"],
    deprecatedNames: [],
    continentCode: "NA",
    continentName: "North America",
    countryName: "United States",
    countryCode: "US",
    mainCities: ["Los Angeles", "San Diego", "San Jose", "San Francisco"],
    rawOffsetInMinutes: -480,
    abbreviation: "PST",
    rawFormat: "-08:00 Pacific Time - Los Angeles, San Diego, San Jose, San Francisco",
  },
  // ...
];

timeZonesNames

This is an array of time zone names:

[
  // ...
  "America/Juneau",
  "America/Kentucky/Louisville",
  "America/Kentucky/Monticello",
  "America/Kralendijk",
  "America/La_Paz",
  "America/Lima",
  "America/Los_Angeles",
  "America/Lower_Princes",
  "America/Maceio",
  "America/Managua",
  "America/Manaus",
  "America/Marigot",
  "America/Martinique",
  "America/Matamoros",
  // ...
];

Notes

• We provide two cities when grouping happens, ranked by population
• We provide alternative names ("Pacific Time" for "America/Los_Angeles") and remove "Standard", "Daylight" or "Summer" from them
• If you're using this to build a time zone selector and saving to a database then:
  • make sure to save the name attribute (America/Los_Angeles) in your database
  • when displaying the select with a default value from your database, either select the time zone name that matches, or if the time zone name is part of the group. Example:

const value = timeZones.find((timeZone) => {
  return dbData.timeZone === timeZone.name || timeZone.group.includes(dbData.timeZone);
});