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Calculators » Date & Time » Day of the Week

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* The Gregorian calendar is the most widespread civil calendar and de facto international standard.

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The formula for finding "What day of the week was?" (This method is valid for both the Gregorian calendar and the Julian calendar):

dotw = (d + m + y + ⌊y/4⌋ + c) mod 7, where:

- d is the day of the month,
- m is the month's number in the months table,,
- y is the last two digits of the year, and,
- c is the century number. For a Gregorian date, this is 6 if the first two digits of the year are evenly divisible by 4, and subsequent centuries are 4-2-0 (so the century numbers for 2000, 2100, 2200, and 2300 are respectively 6, 4, 2, and 0). For a Julian date, this is 6 for 1200, and subsequent centuries subtract 1 until 0, when the next century is 6 (so 1300 is 5, and 1100 is 0).,

See this Wikipedia entry for complete details and other ways for calculating day of week.

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