Timezone Test Value Generator
Picks a real IANA timezone identifier (e.g. Europe/London, America/Sao_Paulo) — useful test input for date/time code that needs to handle more than one region correctly.
What you'll get
This generator draws from a hand-checked list of 20 entries. Here is a spread of 6 of them, so you can see the style before you generate:
- UTC
- Europe/Berlin
- America/Chicago
- Asia/Tokyo
- Asia/Dubai
- Pacific/Auckland
A fixed sample of the list, not a live draw — your own results are picked at random from all 20, without repeating until the list runs out. IANA Time Zone Database (public domain identifiers, well-known names).. Last reviewed 2026-07-18.
How to use this tool
- Press generate for a timezone.
- Generate again for a different one.
Common use cases
- Testing date/time logic across regions
- Populating a timezone-picker demo
- Documentation examples
Limitations and good to know
- 20 well-known zones out of several hundred in the IANA database — enough to spot-check the common offset and DST cases, not exhaustive coverage of every region.
- These are identifiers only. Nothing here computes what time it currently is in a zone, or converts a timestamp between two of them.
- Zone rules occasionally change (a country moves its DST dates, for instance), so treat the identifier as stable but not the offset it currently implies as permanent.
Practical tips
- Test a zone with a half-hour or three-quarter-hour offset as well as whole hours; a surprising amount of code assumes whole hours.
- Include a zone that observes daylight saving and one that does not — the transition is where most date bugs live.
Entries are chosen with your browser's cryptographic random number generator, so every entry on the list is equally likely. How Generate Random works.
Frequently asked questions
- Why use a named zone like Europe/London instead of a fixed UTC offset?
- Because a fixed offset can't represent daylight saving — UTC+0 or UTC+1 is only true for part of the year in London, while the identifier Europe/London always resolves to the correct current offset. Testing with named zones catches bugs that testing with fixed offsets alone never surfaces.
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