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2 results for “weekday”

Formulae (2)

h = \left(q + \left\lfloor\tfrac{13(m+1)}{5}\right\rfloor + K + \left\lfloor\tfrac{K}{4}\right\rfloor + \left\lfloor\tfrac{J}{4}\right\rfloor + 5J\right) \bmod 7

Finds the day of the week for any Gregorian date.

W = \left(d + \left\lfloor 2.6m - 0.2 \right\rfloor + y + \left\lfloor\tfrac{y}{4}\right\rfloor + \left\lfloor\tfrac{c}{4}\right\rfloor - 2c\right) \bmod 7

Gauss's weekday formula — find which day of the week any birthdate fell on.