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Unix Timestamp Converter

Convert Unix seconds or milliseconds to UTC dates and back. Tool input is processed locally, without uploading it.

Runs locally

Drop a timestamp file here, or choose Open file. Up to 1 MB. Files stay in your browser.

Preview limit: 1 MB (1,000,000 UTF-8 bytes). Output is limited to 2 MB. Large text scrolls horizontally.

Guide

Convert between a Unix timestamp and a calendar date. Choose seconds or milliseconds when reading a timestamp, or include a time zone when entering a date, so the result refers to the intended instant.

  1. Choose a direction

    Select Timestamp to date or Date to timestamp.

  2. Choose the unit

    For timestamps, select Seconds or Milliseconds to match your source.

  3. Add a value

    Paste a value, try Example: 2024 or Example: 1970, or use Open file. Dates need Z or a timezone offset.

  4. Read the result

    Output updates automatically. Convert runs the current value again.

  5. Keep or share it

    Copy or download Output. Share input creates a link containing your input and selected settings.

On mobile, choose Output to read the result. Clear removes both fields.

Direction

  • Timestamp to date: enter a numeric timestamp and select its unit.
  • Date to timestamp: enter a date with Z for UTC (Coordinated Universal Time) or an explicit time-zone offset.

Unit

  • Seconds: count seconds since 1 January 1970. Example: 1704067200.
  • Milliseconds: count thousandths of a second since 1 January 1970. Example: 1704067200000 represents the same instant.
Shortcuts
  • Ctrl / Cmd + Enter — Run selected action
  • Ctrl / Cmd + Shift + C — Copy output
  • Ctrl / Cmd + S — Download output
  • ? — Show shortcuts outside text fields

Shortcuts work while focus is in the workspace. Copy and download need valid output.

Common questions
Is my timestamp in seconds or milliseconds?
Choose the unit used by your source. The tool never guesses; a millisecond value is 1,000 times the corresponding seconds value.
Why must a date include Z or an offset?
A timezone makes the instant unambiguous. Z means UTC. A date without a timezone is rejected rather than interpreted using your device's timezone.
Can I use negative or fractional timestamps?
Yes. Seconds allow up to three decimal places, and milliseconds must be integers. Supported UTC years are 0001–9999.
Is my data saved?
No. Only the direction and unit preference are saved when storage is available. Your input, output and file names stay in the open page.
What do the example years mean?
Example: 1970 represents timestamp 0, when Unix time starts. Example: 2024 represents 1 January 2024, 00:00 UTC.

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