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Unix timestamp converter

Convert a Unix timestamp in seconds or milliseconds to a date in UTC and your time zone, or a date back to a timestamp, with the current time ticking.

Stays on your device

Everything runs in your browser. Nothing you type is sent to Sellstamp or anyone else.

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How to use it

  1. Type a timestamp in seconds or milliseconds, or a date.
  2. Check which unit it was read as.
  3. Read it in UTC, in your time zone, and as seconds and milliseconds.

Nothing you paste leaves this page

The conversion runs in this browser tab. Nothing is sent to Sellstamp or anyone else, which matters for configuration files, customer exports and tokens.

Seconds or milliseconds?

Numbers below 100 billion are read as seconds, below 100 trillion as milliseconds, and larger ones as microseconds, which covers every date from 1973 to the year 5000. The page says which reading it used. Dates you type are read by your browser; include a time zone (Z or +02:00) to be sure.

Questions

What is a Unix timestamp?

The number of seconds since 00:00:00 UTC on 1 January 1970, ignoring leap seconds.

Is my timestamp in seconds or milliseconds?

Ten digits is seconds; thirteen is milliseconds. The page detects it and says which.

What is the year 2038 problem?

Systems that store seconds in a signed 32-bit integer overflow on 19 January 2038. 64-bit storage avoids it.

Why is my converted time off by hours?

A date typed without a time zone is read in your local zone. Add Z for UTC.