Time Zone Converter

Convert any date and time between IANA time zones. DST-aware via the browser's up-to-date time-zone database.

Time Zone Converter

Convert a date/time between IANA time zones (DST-aware via the browser's time-zone database).

Source date/time:

From zone: To zone:

About the Time Zone Converter

Pick a source date/time, source zone (any IANA zone like America/Los_Angeles or Europe/London) and a target zone. OmniWhen returns the equivalent moment in the target zone with the local date, day of the week and short zone name.

The converter accounts for daylight saving time automatically using the browser's built-in time-zone database, so you don't have to.

How it works

OmniWhen uses the browser's Intl API and the IANA time-zone database. Your input is treated as a wall-clock time in the source zone; the calculator computes the equivalent UTC instant accounting for that zone's offset (DST included), then formats that UTC instant in the target zone. DST transitions are handled automatically because they're baked into the IANA database the browser ships with.

Examples

Mar 1, 2026 09:00 America/Los_Angeles → Asia/TokyoMar 2, 2026 02:00 JST
Jul 4, 2026 12:00 UTC → Europe/LondonJul 4, 2026 13:00 BST

Frequently asked questions

How is daylight saving time handled?

Automatically. The browser's IANA database knows when each zone observes DST and applies the correct offset for the instant you specify.

What about ambiguous local times during the fall-back hour?

The browser picks one of the two possible instants. For mission-critical scheduling, use UTC as the source.

Can I convert times far in the past or future?

Yes, but historical DST rules drift and far-future rules can change. Use it as a working estimate.