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Timestamp Converter

Convert Unix timestamps to human dates and back, in your local time zone.

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timestamp or date

Try a worked example

Example

Convert 1700000000 to get 1700000000000 milliseconds and 2023-11-14T22:13:20.000Z. Entering that ISO date or the 13-digit millisecond value gives the same instant.

Keep in mind

Integer inputs longer than 11 characters are treated as milliseconds; shorter ones are seconds. For date text, include Z or an explicit UTC offset to avoid local-time ambiguity. The local-time row follows your device time zone.

About this tool

Convert a Unix timestamp (in seconds or milliseconds) into a readable date in ISO, UTC and your local time zone, with a relative description like "3 days ago". Type a date and get the timestamp back. Detects seconds vs milliseconds automatically.

Frequently asked questions

Seconds or milliseconds?

Both. The tool auto-detects: long values are treated as milliseconds, shorter ones as seconds.

What is a Unix timestamp?

It is the number of seconds since 1 January 1970 UTC (the Unix epoch), a common way to store time in software.