🗓️ DAY OF WEEK
What day of the week was that date?
Birthdays, old memories, future plans — find the weekday instantly.
THAT DATE WAS / WILL BE
Day of year
Week number*
Leap year?
Date
*ISO week number.
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What calendar does this use?
Weekdays follow the Gregorian calendar. The tool also shows the day number within that year, whether the year is a leap year and the ISO week number.