Every timestamp, one tidy desk.
Turn Unix seconds, milliseconds or an ISO 8601 date into readable time across the zones you care about.
Unix seconds
Unix milliseconds
ISO 8601 (UTC)
RFC 2822
Local time
Relative
Same moment elsewhere
How it works
Numbers. Ten digits or fewer are read as seconds, thirteen as milliseconds. The detected unit is shown and you can force either one.
Dates. ISO 8601 strings such as 2026-01-01T00:00:00Z or 2026-03-05T10:30:00+02:00 work. Without an offset the time is taken as UTC.
FAQ
Does anything leave my browser?
No. The page is static and every conversion is done by your browser's own date functions.
What is the Unix epoch?
It is 1970-01-01T00:00:00Z. A Unix timestamp counts the seconds since then, ignoring leap seconds.
Why do the zone times differ in daylight saving?
Zone names come from the IANA database built into your browser, so offsets follow the rules in force on the chosen date.