Time Zone Abbreviations

How to use

1. 1Search by abbreviation (EST, PST, GMT, IST, JST), full name, country (India, Japan, Brazil), or IANA zone (Asia/Kolkata, Europe/London). Typing an exact abbreviation auto-pins it in the detail card.
2. 2Use the Region chips to narrow the catalog to Americas, Europe, Asia, Oceania, Africa, Pacific, or Global.
3. 3Click any card in the browse grid to pin it. The detail panel shows the full name, UTC offset, standard or daylight kind, DST companion, where it is used, and the live wall-clock time in each canonical IANA city.
4. 4Open the Compare two abbreviations panel and pick any two zones (EST vs PST, GMT vs IST, CET vs JST, EDT vs BST) to see the fixed offset gap and the live current offset gap that includes daylight saving.
5. 5Use the Copy abbreviation, Copy offset, Copy summary, and Copy compare summary buttons to drop the information into a calendar invite, email, ticket, or chat message.

About this tool

Time Zone Abbreviations is a browser-only reference for the short time zone codes that show up in calendars, emails, chat, code, support tickets, and travel itineraries. Each entry gives the full English name (Eastern Standard Time, Pacific Daylight Time, Greenwich Mean Time, Coordinated Universal Time), the fixed UTC offset associated with the abbreviation, whether it is the standard or daylight saving variant, the companion abbreviation when one exists (EST and EDT, PST and PDT, GMT and BST, AEST and AEDT, NZST and NZDT, CET and CEST), the region, a representative list of countries or cities that use it, and one or more canonical IANA time zone identifiers. For every IANA zone the page shows the live wall-clock time, the actual current UTC offset that the browser sees for that zone (so daylight saving transitions are reflected immediately), and the short name the browser is emitting right now, with a badge that calls out whether the zone is currently on the abbreviation you selected or on its DST companion. Common ambiguities are surfaced directly in the description so you do not get caught out: IST means India Standard Time (UTC+5:30) but is also Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1); CST means United States Central Standard Time (UTC-6) but is also China Standard Time (UTC+8) and Cuba Standard Time (UTC-5); BST means British Summer Time (UTC+1) but is also Bangladesh Standard Time (UTC+6); AST means Atlantic Standard Time (UTC-4) but is also Arabia Standard Time (UTC+3). A compare panel lets you pick any two abbreviations and prints both the fixed offset gap (the answer to is EST ahead of PST) and the live current offset gap, taking the actual DST state of each zone's primary IANA city into account. A search box accepts the abbreviation, the full name, the country (India, Japan, Australia, Argentina), or an IANA zone path (Asia/Kolkata, Europe/London, America/New_York). Region filter chips narrow the catalog to Americas, Europe, Asia, Oceania, Africa, Pacific, or Global. All data and clock math runs in your browser, so nothing about the abbreviation you look up, the cities you compare, or the date you are scheduling around is sent to a server.

Free to use. Works in your browser. No signup, no login.