Get time zone, daylight saving time, and base offset for any US ZIP code.
ZIP codes are up to date as of May 2024.
Ziptz is tested to work with the following versions of Ruby:
- Ruby 3.1.x, 3.2.x, 3.3.x
Add the gem to your Gemfile:
gem 'ziptz'
Starting with version 6.0.0, you'll need to supply your own time zone SQLite database file. You can subscribe to the required dataset here: ZIP Code Time Zones Dataset
First, initialize Ziptz with the path to your time zone database file:
z = Ziptz.new('/path/to/your/tz.db')
# or using keyword argument
z = Ziptz.new(db: '/path/to/your/tz.db')
Get the time zone name for any ZIP code:
z.time_zone_name('97213') #=> "America/Los_Angeles"
Get the time zone offset for any ZIP code:
z.time_zone_offset('97213') #=> -28800
Note that offsets do not include daylight saving time.
Determine if the ZIP code uses Daylight Saving Time:
z.time_zone_uses_dst?('97213') #=> true
Get all the zip codes in a time zone:
z.zips('Pacific/Chuuk') #=> ["96942", "96943"]
- America/Adak
- America/Anchorage
- America/Boise
- America/Chicago
- America/Denver
- America/Detroit
- America/Indiana/Indianapolis
- America/Indiana/Knox
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Tell_City
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Juneau
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Los_Angeles
- America/Menominee
- America/Metlakatla
- America/New_York
- America/Nome
- America/North_Dakota/Beulah
- America/North_Dakota/Center
- America/North_Dakota/New_Salem
- America/Phoenix
- America/Puerto_Rico
- America/Sitka
- America/St_Thomas
- America/Yakutat
- Pacific/Chuuk
- Pacific/Guam
- Pacific/Honolulu
- Pacific/Kosrae
- Pacific/Kwajalein
- Pacific/Majuro
- Pacific/Pago_Pago
- Pacific/Palau
- Pacific/Pohnpei
- Pacific/Saipan
- Pacific/Wake
Note that APO/FPO zip codes will not return a known time zone offset.
If you would prefer raw data instead of a gem, see my ZIP Code Time Zones product on AWS Data Exchange to subscribe.
- APO, DPO, and FPO zip codes are no longer included, because they are non-geographic.
- Time zone offsets are now specified in seconds instead of hours.
- Time zone are now more granular. The full list of time zones is:
- America/Adak
- America/Anchorage
- America/Boise
- America/Chicago
- America/Denver
- America/Detroit
- America/Indiana/Indianapolis
- America/Indiana/Knox
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Tell_City
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Juneau
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Los_Angeles
- America/Menominee
- America/Metlakatla
- America/New_York
- America/Nome
- America/North_Dakota/Beulah
- America/North_Dakota/Center
- America/North_Dakota/New_Salem
- America/Phoenix
- America/Puerto_Rico
- America/Sitka
- America/St_Thomas
- America/Yakutat
- Pacific/Chuuk
- Pacific/Guam
- Pacific/Honolulu
- Pacific/Kosrae
- Pacific/Kwajalein
- Pacific/Majuro
- Pacific/Pago_Pago
- Pacific/Palau
- Pacific/Pohnpei
- Pacific/Saipan
- Pacific/Wake
Time zone names now reflect standard tz-database names.
| V1 Name | V2 Name |
|---|---|
| Atlantic | America/Puerto_Rico |
| Eastern | America/New_York |
| Central | America/Chicago |
| Mountain | America/Denver |
| Pacific | America/Los_Angeles |
| Hawaii-Aleutian Islands | Pacific/Honolulu or America/Adak |
| American Samoa | Pacific/Pago_Pago |
| Marshall Islands | Pacific/Majuro |
| Guam | Pacific/Guam |
| Palau | Pacific/Palau |
| Micronesia | Pacific/Pohnpei |
Copyright (c) 2015-2024 Keith Morrison <[email protected]>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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