Day of the Week Calculator
Enter a date to find out which day of the week it falls on.
Your calculation is performed in your browser.How it works
The calculator normalizes your chosen date to a calendar day and reads off its weekday directly from the calendar, so it works identically for dates far in the past or future.
Formula & methodology
The weekday is determined from the date itself using standard calendar arithmetic, then labeled Sunday through Saturday (and given as ISO weekday number 1–7, Monday through Sunday).
Worked example
July 20, 1969 was a Sunday.
Important notes
- —Works for any date the browser can represent, including dates well before or after today.
- —The result also flags whether the date falls on a weekend (Saturday or Sunday).