Does it support seconds and milliseconds?

Yes. Auto mode detects the unit from the number's length, or you can force seconds or milliseconds explicitly.

Which timezone does it use?

The readable date is shown in the timezone you pick — your local zone and UTC are always available, plus every IANA timezone your browser supports.

No. All conversion happens in your browser — nothing leaves your device.

Unix time counts from 1970-01-01 UTC. Most systems use seconds (10 digits today); JavaScript and many APIs use milliseconds (13 digits).

Convert Unix timestamps to human-readable dates and back. Live, in any timezone — everything runs in your browser.

Current Unix time

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Timezone

Enter a timestamp above.

Date & time (your local time)

Seconds

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Milliseconds

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1See the current Unix time at the top, updating live.
2Paste a timestamp to convert it to a date — seconds and milliseconds are auto-detected.
3Or pick a date and time to get the matching epoch value. Choose a timezone for the readable output.

Does it support seconds and milliseconds?: Yes. Auto mode detects the unit from the number's length, or you can force seconds or milliseconds explicitly.
Which timezone does it use?: The readable date is shown in the timezone you pick — your local zone and UTC are always available, plus every IANA timezone your browser supports.
Is anything sent to a server?: No. All conversion happens in your browser — nothing leaves your device.
What's the difference between Unix seconds and milliseconds?: Unix time counts from 1970-01-01 UTC. Most systems use seconds (10 digits today); JavaScript and many APIs use milliseconds (13 digits).