What day of the week was I born?

Enter your birth date and the calculator will tell you which day of the week it was.

How far into the future can I check?

The calculator works for any valid date, past or future, without practical limits.

Algorithms like Zeller's formula or the Doomsday algorithm can determine the weekday for any date mathematically.

The calculator uses the Gregorian calendar, which has been in use since 1582 in most of the world.

Enter the date to find out. The day changes each year as a regular year shifts the day by 1 and a leap year by 2.

Find out what day of the week any date falls on. Check past, present, or future dates instantly.

Count days forward or backward from any date. Find what date falls a specific number of days from no…

Calculate the exact number of days, weeks, months, and years between any two dates. Includes busines…

Calculate your exact age in years, months, days, hours, and minutes. Enter your date of birth to fin…