Does it detect seconds or milliseconds?

Yes. Ten-digit values are read as seconds and thirteen-digit values as milliseconds, so pasting either form works without switching modes.

Which time zone is used?

Both: conversions show your local zone and UTC side by side, and the date-to-timestamp direction uses your system clock and zone.

Can I convert a date back to a timestamp?

Yes. The right-hand pane takes a date and time and returns the epoch value.

Is anything sent to a server?

No. Conversion is arithmetic on your machine, using your system clock.

Conversion · time

Unix timestamp converter

Convert epoch timestamps to readable dates and back. Seconds and milliseconds are detected automatically; everything is shown in your local zone and UTC.

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Timestamp → date epoch seconds or ms

Unix timestamp leave empty for now

Precision

Seconds standard Milliseconds JavaScript

Try 0 1000000000 1700000000

Date → timestamp Loading timezone…

Date & time local timezone

Try 2025-05-01 2025-05-01 12:30:00 5/1/2025 2:30 PM

Ten-digit numbers are treated as seconds, thirteen-digit as milliseconds. Uses your system clock and timezone

Frequently asked

Does it detect seconds or milliseconds?: Yes. Ten-digit values are read as seconds and thirteen-digit values as milliseconds, so pasting either form works without switching modes.
Which time zone is used?: Both: conversions show your local zone and UTC side by side, and the date-to-timestamp direction uses your system clock and zone.
Can I convert a date back to a timestamp?: Yes. The right-hand pane takes a date and time and returns the epoch value.
Is anything sent to a server?: No. Conversion is arithmetic on your machine, using your system clock.