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
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.
Related generators
- Locale Code PickerA real BCP 47 locale code, like en-GB or ja-JP, for testing internationalisation.
- Boundary Value GeneratorA standard numeric or string boundary value used in software testing, like a max-int or an empty string.
- Date Edge Case GeneratorThe dates that break software — leap days, month ends, clock changes, ISO week boundaries — as real test data.
- Timezone Edge Case GeneratorThe moments that break time handling — the hour that never happens, the hour that happens twice, offsets that are not whole hours — as test data you can commit.