Developer Tools

Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates in your local timezone, UTC, and ISO 8601 format, and convert any date back to a Unix timestamp. Handles both seconds and milliseconds.

Converts seconds and milliseconds Shows local, UTC, ISO 8601 and relative Browser-only

Timestamp → Human date

Paste a Unix timestamp in seconds or milliseconds

Local time—
UTC—
ISO 8601—
Relative—

Date → Unix timestamp

Pick a date and time to convert

Seconds —
Milliseconds —
Input Text Output Text Browser-only No upload by default

Features

  • Converts Unix timestamp → local time, UTC, ISO 8601, relative time
  • Converts any date → Unix timestamp in seconds and milliseconds
  • 'Now' button inserts the current timestamp
  • Handles both second and millisecond timestamps
  • Shows relative time (e.g. '3 days ago')
  • Browser-only. No server needed

How to use it

  1. Paste a Unix timestamp (seconds or ms) in the timestamp field.
  2. Local, UTC, and ISO dates appear instantly.
  3. Or enter a date and time to get its Unix timestamp.
  4. Click 'Use Now' to insert the current timestamp.

Use cases

  • Debugging API responses with epoch timestamps
  • Converting log timestamps to readable dates
  • Finding the Unix timestamp for a specific deployment time
  • Interpreting JWT expiry (exp) and issued-at (iat) timestamps

Limitations

  • Timestamps before 1 January 1970 (negative values) are not supported.
  • Very far-future dates may not display correctly depending on browser support.
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Questions & answers

Frequently asked

How do I know if my timestamp is in seconds or milliseconds?

Unix timestamps in seconds are ~10 digits (e.g. 1717200000). Timestamps in milliseconds are ~13 digits. The tool auto-detects based on magnitude.

Does the tool handle milliseconds?

Yes. Timestamps longer than 11 digits are treated as milliseconds. Standard 10-digit timestamps are treated as seconds.

What timezone is used for 'local time'?

The timezone of your browser and operating system. UTC is always shown separately for reference.