Time & Systems

Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to ISO 8601, UTC, and local time. Also convert readable dates back to Unix. Auto-detects seconds vs milliseconds.

● LOCAL ● NO NETWORK ● ISO 8601 / Unix time

Current Unix time (seconds)

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About Unix Timestamps & Timezones

What it does

Converts between Unix timestamps (the number of seconds or milliseconds elapsed since 1970-01-01T00:00:00Z) and human-readable date-time formats including ISO 8601, UTC, and your browser's local timezone. Timestamps are auto-detected: values above 10¹⁰ are treated as milliseconds.

No data leaves your browser. All conversions run locally using the browser's Date API.
EngineDate API (browser native)
StandardsISO 8601, Unix time (POSIX)
TimezoneBrowser local timezone + UTC

Limitations

  • Timestamps before 1970-01-01 (negative Unix time) are supported by modern browsers but may display inconsistently in some locales.
  • Timezone accuracy depends on your browser's Intl/timezone database, which may lag behind IANA updates by one browser release.