Time Converter

Convert Unix timestamps, date strings, and CF Absolute Time to ISO 8601, RFC 2822, UTC, local time, and more directly in your browser. Read more

Convert time formats in your browser

This time converter turns Unix timestamps (seconds or milliseconds), date strings, CF Absolute Time, or a date-time picker value into common display formats. Conversion runs locally in your browser.

Unix timestamps represent seconds or milliseconds since 1970-01-01T00:00:00.000Z. Apple CF Absolute Time counts seconds since 2001-01-01T00:00:00.000Z. Both are absolute and do not depend on the input time zone.

How to use

  1. Choose Input Source: Text or Date Time Picker.
  2. For text, select a Text Format, or leave Auto to detect numeric timestamps versus date strings.
  3. Set Input Time Zone for wall-clock values without an explicit offset (picker values and many date strings).
  4. Set Output Time Zone for RFC and zoned display fields.
  5. Click Convert, or keep Auto Update enabled.

Text formats

  • Auto — numeric 10-digit values as seconds, 13-digit values as milliseconds; otherwise parse as a date string. Ambiguous digit lengths require an explicit Unix unit. Auto does not guess CF Absolute Time.
  • Unix Timestamp / Unix Timestamp (Milliseconds) — force seconds or milliseconds.
  • Date String — ISO-like strings, RFC-style dates, and other browser-parseable text. ISO-like strings without an explicit offset use the input time zone. Strings with Z or an offset use that offset. Other browser-parseable date strings are parsed by the browser and may follow browser-local parsing rules.
  • CF Absolute Time — seconds since 2001-01-01 UTC (fractional seconds allowed).

Output fields

Numeric values:

  • Unix Timestamp (Seconds / Milliseconds)
  • CF Absolute Time

Formatted standards (email and SQL use the output time zone; HTTP dates are always GMT):

  • ISO 8601 / RFC 3339 — 2026-07-25T13:45:30+08:00
  • Email (RFC 5322 / RFC 2822) — Sat, 25 Jul 2026 13:45:30 +0800
  • Email (RFC 822) — Sat, 25 Jul 26 13:45:30 +0800
  • HTTP (RFC 9110 / RFC 7231 / RFC 1123) — Sat, 25 Jul 2026 05:45:30 GMT
  • HTTP (RFC 850) — Saturday, 25-Jul-26 05:45:30 GMT
  • HTTP (ANSI C asctime) — Sat Jul 25 05:45:30 2026
  • SQL (ISO 9075) — 2026-07-25 13:45:30
  • UTC Time — fixed YYYY-MM-DD HH:mm:ss UTC
  • Local Time — browser local wall time, with IANA zone name when available (e.g. Local Time (Asia/Taipei))

If you only need epoch values, use Auto or select Unix Timestamp / Unix Timestamp (Milliseconds) directly.

Time converter FAQ

Is my input uploaded?

No. Parsing and formatting run in your browser.

Why did Auto reject my number?

Values that are not clearly 10-digit seconds or 13-digit milliseconds are treated as ambiguous. Choose Unix Timestamp or Unix Timestamp (Milliseconds).

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