2026b

Zone Changes

• Update to latest OSM data.
• Recalculate timezones since 1970 and timezones since now with most recent timezone database data.

2026a

2026a

Zone Changes

• Update to latest OSM data
• Add an expected zone overlap between America/Los_Angeles and America/Vancouver for a disputed area of seaward boundary of the Strait of Juan de Fuca.

Other Changes

• Implement a maximum overpass request gap.

2025c

Zone Changes

• Merge ocean zones into other zones that have similar timekeeping methods in 1970 with oceans and Now with oceans data products. (#187)
• Update to latest OSM data

Other Changes

• Include mapping of combined zones with similar timekeeping methods as release outputs. (#195)
• Update Readme with notes on zone merging including visualizations. (#194)
• Improve algorithm for calculating zones with similar timekeeping methods. (#191)

2025b

Zone Changes

• Add new zone America/Coyhaique by taking area from America/Santiago.
• Directly use OpenStreetMap data for areas in North and South Dakota.
• Update to latest OSM data

2025a

Zone Changes

• Update to latest OSM data

2024b

Zone Changes

• Remove Asia/Choibalsan as it has been moved to the "backward" file in the timezone database.
• Add an expected zone overlap between Asia/Pyongyang and Asia/Shanghai for a disputed area within the Tumen River.
• Explicitly include Kalapani Territory in both Asia/Kathmandu and Asia/Kolkata.
• Update to latest OSM data

Other Changes

• Update a few npm pacakges.

2024a

Zone Changes

• Update to reflect "same since now" changes taking effect in Kazakhstan
• Update to latest OSM data

Other Changes

• Add GitHub Action to create a new issue upon detecting a new timezone database release (#169)
• Additional notes in #168

2023d

Zone Changes

• Directly use OpenStreetMap timezone relations for the following zones:
  • Asia/Shanghai
  • Asia/Tashkent
  • Asia/Thimphu
  • Asia/Urumqi
  • Asia/Yangon
  • Asia/Yekaterinburg
  • Australia/Adelaide
  • Australia/Brisbane
  • Australia/Darwin
  • Australia/Hobart
  • Australia/Lindeman
  • Australia/Lord_Howe
  • Australia/Melbourne
  • Australia/Perth
  • Europe/Astrakhan
  • Europe/Berlin
  • Europe/Busingen
  • Europe/Kirov
  • Europe/Kyiv
  • Europe/Moscow
  • Europe/Paris
  • Europe/Samara
  • Europe/Saratov
  • Europe/Volgograd
  • Indian/Kerguelen
  • Pacific/Auckland
  • Pacific/Gambier
  • Pacific/Guam
  • Pacific/Honolulu
  • Pacific/Kwajalein
  • Pacific/Majuro
  • Pacific/Midway
  • Pacific/Noumea
  • Pacific/Pago_Pago
  • Pacific/Pitcairn
  • Pacific/Tahiti
• Update to latest OSM data

Other Changes

• Add code to be able to output additional release products (#145)
  • Add output of zones that share same timekeeping method since 1970
  • Add output of zones that share same timekeeping method since the current time
• Add caching of various operations to reuse data from previous calculations
• Refactor input data output
  • Move downloads to dedicated folder
  • Add cached data to dedicated folder
  • Include root-level files in root of zip file
• Add ability to reuse downloaded OSM timezone comparison data by copying it to the working directory and reusing it on calculation retries
• Refactor README noting new release types
• Note Sponsorship Opportunity

2023b

Zone Changes

• Directly use OpenStreetMap timezone relations for the following zones:
  • Africa/Porto-Novo
  • America/Anchorage
  • America/Fortaleza
  • America/Havana
  • America/Metlakatla
  • America/Nome
  • America/Noronha
  • America/Nuuk
  • America/Puerto_Rico
  • America/Punta_Arenas
  • America/Recife
  • America/Santiago
  • America/Sao_Paulo
  • America/Sitka
  • America/St_Thomas
  • Arctic/Longyearbyen
  • Asia/Aqtau
  • Asia/Atyrau
  • Asia/Bangkok
  • Asia/Famagusta
  • Asia/Gaza
  • Asia/Hebron
  • Asia/Ho_Chi_Minh
  • Asia/Jerusalem
  • Asia/Kamchatka
  • Asia/Khandyga
  • Asia/Krasnoyarsk
  • Asia/Kuala_Lumpur
  • Asia/Magadan
  • Asia/Nicosia
  • Asia/Pyongyang
  • Asia/Qostanay
  • Asia/Qyzylorda
  • Asia/Srednekolymsk
  • Asia/Ust-Nera
  • Asia/Vladivostok
  • Asia/Yakutsk
  • Pacific/Easter
• Allow timezones America/Anchorage and America/Dawson to overlap (#145)
• Update to latest OSM data

2022g

Zone Changes

• Merge America/Pangnirtung into America/Iqaluit
• Create new zone America/Ciudad_Juarez by taking area from America/Ojinaga
• Allow timezones Europe/Ljubljana and Europe/Zagreb to overlap
• Directly use OpenStreetMap timezone relations for the following zones:
  • Africa/Cairo
  • Africa/Casablanca
  • Africa/Ceuta
  • Africa/El_Aaiun
  • Africa/Johannesburg
  • Africa/Juba
  • Africa/Kinshasa
  • Africa/Lubumbashi
  • Africa/Ouagadougou
  • America/Adak
  • America/Danmarkshavn
  • America/Lower_Princes
  • America/Maceio
  • America/Marigot
  • America/Scoresbysund
  • America/Thule
  • Asia/Almaty
  • Asia/Barnaul
  • Asia/Choibalsan
  • Asia/Hovd
  • Asia/Irkutsk
  • Asia/Jakarta
  • Asia/Jayapura
  • Asia/Kuching
  • Asia/Makassar
  • Asia/Novokuznetsk
  • Asia/Omsk
  • Asia/Pontianak
  • Asia/Sakhalin
  • Asia/Samarkand
  • Asia/Ulaanbaatar
  • Atlantic/Azores
  • Atlantic/Canary
  • Atlantic/Madeira
  • Europe/Amsterdam
  • Europe/Belgrade
  • Europe/Helsinki
  • Europe/Lisbon
  • Europe/Ljubljana
  • Europe/London
  • Europe/Madrid
  • Europe/Oslo
  • Europe/Simferopol
  • Europe/Vienna
  • Indian/Chagos
  • Indian/Christmas
  • Indian/Cocos
  • Indian/Mayotte
  • Indian/Reunion
  • Pacific/Chatham
  • Pacific/Chuuk
  • Pacific/Galapagos
  • Pacific/Kanton
  • Pacific/Kiritimati
  • Pacific/Marquesas
  • Pacific/Norfolk
  • Pacific/Port_Moresby
  • Pacific/Rarotonga
  • Pacific/Tarawa
  • Pacific/Wake
  • Pacific/Wallis
• Update to latest OSM data