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Date Format Converter

Reformat a list of dates into ISO, US, European, RFC or any custom pattern.

A date format converter parses dates written in any common form — ISO, slashed, written out, or a Unix timestamp — and reformats them consistently. Output as ISO 8601, US or European slashed, long form, RFC 2822, a Unix timestamp, or a custom pattern built from YYYY, MM, DD and month-name tokens.

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Runs entirely in your browser — nothing is uploaded
Cost
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Frequently asked questions

Why is 03/04/2026 ambiguous?

Because it is 3 April in most of the world and 4 March in the United States. There is no way to tell from the string alone, which is exactly why ISO 8601 puts the year first and is unambiguous everywhere.

How to use the date format converter

  1. 1Enter or paste your dates.
  2. 2Choose the convert to.
  3. 3Enter or paste your custom pattern.
  4. 4Enter or paste your locale for month names.
  5. 5The result appears immediately — copy or download it.

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