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Calcimator

Day of Week

Day of week for any Gregorian date (Sakamoto method).

Inputs

Results

Weekday

Friday

Index (0=Sun)5
How to Use This Calculator
  1. Enter a four-digit year.
  2. Enter the month (1-12) and day (1-31).
  3. The calculator uses the Sakamoto algorithm to determine the day of the week for any Gregorian date.
  4. View the weekday name and numeric index (0 = Sunday through 6 = Saturday).
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Formula

Day = (y + ⌊y/4⌋ − ⌊y/100⌋ + ⌊y/400⌋ + t[m−1] + d) mod 7 (Sakamoto's algorithm)
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