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Calculators

Date Format Converter

Parse any date or timestamp, then preview it in 30+ output formats — ISO, RFC, locale, Unix, Excel, custom tokens, and side-by-side timezones.

Input

Paste a date string, pick a timestamp, or build one field by field.

Date string
Date format hint
Input timezone
Output timezone
Could not parse input: Empty input

Reference

Common pitfalls

  • 01/02/03 is ambiguous: US reads it as Jan 2 2003, Europe as Feb 1 2003.
  • JavaScript Date.parse() is not standardized — different browsers may disagree on the same string.
  • Daylight saving transitions can make a wall-clock time skip or repeat — IANA zones handle this; UTC offsets alone do not.
  • Excel serials before March 1900 are wrong because Excel treats 1900 as a leap year (Lotus 1-2-3 bug).
  • Always store dates in UTC and convert for display — never store offset-stripped local times.

Timezone abbreviations

  • UTCCoordinated Universal Time — the reference time.
  • GMTGreenwich Mean Time — equivalent to UTC for civil use.
  • ESTEastern Standard Time (UTC−05:00)
  • EDTEastern Daylight Time (UTC−04:00)
  • PSTPacific Standard Time (UTC−08:00)
  • PDTPacific Daylight Time (UTC−07:00)
  • CETCentral European Time (UTC+01:00)
  • CESTCentral European Summer Time (UTC+02:00)
  • TRTTürkiye Time (UTC+03:00)
  • JSTJapan Standard Time (UTC+09:00)
  • AESTAustralian Eastern Standard (UTC+10:00)