Unix Epoch Timestamp Converter

About the Unix Epoch Timestamp Converter

Convert a Unix timestamp, the number of seconds since 1970-01-01 00:00:00 UTC, into ISO 8601, a UTC string and your local time, with the same moment shown in several world time zones. Go the other way by picking a date and time to get second and millisecond timestamps.

The unit is detected from the number of digits (10 digits is seconds, 13 is milliseconds, 16 is microseconds, 19 is nanoseconds) and can be set by hand with the unit selector.

How to use it

1. Type a timestamp into the converter, or press Now to use the current time.
2. Leave the unit on Auto or choose seconds, milliseconds, microseconds or nanoseconds.
3. Read the ISO, UTC, local and relative results, or use the date picker below to go from a date to a timestamp.

Worked example

ISO 8601 result, detected as seconds. The same moment in milliseconds is 1700000000000.

1700000000

2023-11-14T22:13:20.000Z

Common mistakes and gotchas

• Mixing up seconds and milliseconds puts you in 1970 or in the far future. A 13-digit value is milliseconds (JavaScript's Date.now()), a 10-digit one is seconds.
• Between 11 and 13 digits the tool reads the number as milliseconds. If you have a seconds value that long, pick seconds in the unit selector.
• The local time shown is your browser's time zone, not the server's. The ISO and UTC strings are always UTC.
• A Unix timestamp has no time zone and no daylight saving. Only the display depends on a zone.

Frequently asked questions