Day of the Week Calculator
Find the day of the week for any date.
Find which day of the week any calendar date falls on.
The math behind it
Sakamoto's algorithm uses a lookup table and the year's leap-year corrections to find the weekday.
Worked example
24 June 2026 is a Wednesday.
FAQ
Does it handle leap years?
Yes - the formula accounts for the Gregorian leap-year rules.