Day of Week Calculator

Enter any date — past, present, or future — and instantly find out what day of the week it falls on.

How the Day of Week Is Determined

The day of the week is calculated using your browser's built-in date engine, which is based on the Gregorian calendar. This calendar has been in use since 1582 and accurately handles all dates within the range supported by JavaScript's Date object (roughly from 100 AD to 275,760 AD). The calculation correctly accounts for leap years and calendar corrections.

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