Day of Week Calculator
Enter a date to find out which day of the week it falls on.
How the day of the week is calculated
This calculator uses your browser's built-in calendar logic to determine the weekday for any date you enter, correctly accounting for leap years and the varying number of days in each month.
This works for any date, past or future, within the range your browser's date system supports — useful for checking what day a historical event fell on, or planning around a future date.
Frequently asked questions
Can I use this for dates far in the past or future?
Yes — the calculator works for any date your browser's date picker accepts, which typically spans a very wide range of years in both directions.
Does it account for leap years?
Yes — the underlying date calculation automatically accounts for leap years, so the weekday result is accurate regardless of whether February has 28 or 29 days in a given year.
Why would I need to know the day of the week for a date?
It's useful for scheduling, verifying historical facts, checking when a recurring event (like a birthday or anniversary) falls on a weekend, or planning events around a specific future date.