Time Zone List
Every IANA time zone your browser knows, with its current UTC offset, abbreviation and whether it observes daylight saving, sorted by offset and searchable.
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Reading the time zone database...
About this tool
Method, assumptions, practical next steps, and limits.
Names, not abbreviations
Store and configure zones by IANA name, such as America/Chicago, never by abbreviation or fixed offset. CST means Central Standard Time in North America, China Standard Time and Cuba Standard Time; a fixed offset such as -06:00 forgets daylight saving. The database is maintained by IANA as the tz database, updated several times a year as governments change rules.
Keep the database updated
Operating systems, language runtimes (Java, PHP's timezonedb) and databases each ship a copy. When a country changes its daylight saving rules at short notice, update all of them, or times near the change will be off by an hour.