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Date & Time Calculators

Day of the Week Calculator

What day of the week any date falls on, past or future, with the week number.

Enter values

Results update as you type.

Result

Day of the week

Tuesday

Full date
Tuesday, September 22, 2026
Day of the year
265
ISO week
Week 39 of 2026
Days remaining in the year
100
Quarter
Q3
Leap year
No
Weekend?
No — a weekday

About the Day of the Week Calculator

What day of the week any date falls on, past or future, with the week number.

Also known as: what day was i born, day of week for date, weekday calculator, what day is this date.

How to use this calculator

  1. Enter date.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Derived from the proleptic Gregorian calendar

Worked example

Using the values pre-filled in the calculator above:

  • Date: 2026-09-22

the calculator returns:

  • Day of the week: Tuesday
  • Full date: Tuesday, September 22, 2026
  • Day of the year: 265
  • ISO week: Week 39 of 2026