Date Format Converter

Convert a date between ISO, US, EU, Unix, and Excel serial formats.

Date input

About this tool

Paste a date in any common format — ISO, MM/DD/YYYY, DD/MM/YYYY, Unix epoch, Excel serial number, RFC 2822, or a long-form string — and see it parsed, normalized, and rendered into every major format at once. Plus a tiny day-of-year, ISO week-number, and weekday helper. The clean answer for r/excel threads like 'convert 21012026 to 21/01/2026' and r/programming 'why is my date off by one'.

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