Enter any date to find which weekday it falls on, plus the day of the year and week number.
How this calculator arrives at its answer
Enter a date and this calculator tells you the weekday, the day number within the year, the week number, and whether it’s a leap year.
Handy for planning, history and settling debates about past and future dates.
Getting your answer
- Enter the date.
- Read the weekday.
- Check the day of year and week number.
How the number is calculated
computed from the calendar, accounting for leap years
The default scenario, worked through
On the values this calculator opens with, the day is Tuesday. Underneath, Day of year comes out at 223 and Week number at 32. Change any field and every figure updates as you type.
Frequently asked questions
What day of the week was a past date?
Enter it and the calculator returns the exact weekday, using the real calendar including leap years.
What is the day of the year?
How many days into the year the date is — 1 for January 1, up to 365 or 366.
How is the week number found?
By dividing the day of the year by seven and rounding up, giving an approximate week of the year.