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Day of the Week Finder

Find which day of the week any date falls on using Zeller's congruence and Sakamoto's algorithm — plus day-of-year, ISO week, days until/since today, next/previous weekday finder, Nth weekday of month (e.g. 2nd Tuesday), recurring-weekday view across a year range, and Doomsday-rule teaching mode. 100% client-side.

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Find which day of the week any date falls on using Zeller's congruence and Sakamoto's algorithm — plus day-of-year, ISO week, days until/since today, next/previous weekday finder, Nth weekday of month (e.g. 2nd Tuesday), recurring-weekday view across a year range, and Doomsday-rule teaching mode. 100% client-side. Everything runs locally in your browser — your data never leaves your device.

How to use

  1. Enter your input in the tool above.
  2. Adjust any options to your preference.
  3. Use the Copy or Download buttons to save the result.
  4. Everything happens locally — your data never leaves your browser.
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