Day of the Week Finder

How this is calculated

This uses the standard Gregorian calendar (the one in everyday use across most of the world today) to work out the weekday for any date, including dates far in the past or future. It also shows the ISO week number and day-of-year count for the same date, in case that's what you're actually after.

Working out someone's age and want to know what day they were born on? The Age Calculator handles both at once.