Finds what day of the week any given date falls on.
The day-of-week calculator tells you which day of the week (Monday, Tuesday, etc.) any calendar date falls on — past or future.
Zeller's congruence or Tomohiko Sakamoto's algorithm (common implementations). For any Gregorian date, the day can be computed from year, month, and day values alone.
What day was 1 January 2000? → Saturday. What day is 19 June 2026? → Friday.
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