SumHexa — Calculate anything.

Day of the week

Find the weekday for any supported date.

Gregorian civil dates from years 0001 to 9999, without time or timezone. Gregorian rules are applied even before their historical local adoption. Example: January 1, 2000 was a Saturday.

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Method and assumptions

Method version 1.0.0 · Updated

Weekday of a date

Formula: Gregorian date → weekday

Gregorian civil dates from years 0001 to 9999, without time or timezone. Gregorian rules are applied even before their historical local adoption. Example: January 1, 2000 was a Saturday.

date
Date

Gregorian calendar from years 0001 to 9999. Date, duration and rounding conventions are specified for each mode.