How do I find the day of the week for a date?

Enter the date in the calculator and it instantly shows the weekday, along with the day of the year and the ISO week number.

What day of the week was I born?

Enter your date of birth as the date and the calculator shows the weekday you were born on, plus how many days have passed since.

What is an ISO week number?

The ISO 8601 week number counts weeks from the first week that contains a Thursday. Most years have 52 weeks; some have 53.

Day of the Week Calculator

Enter any date to find out which weekday it falls on — past, present or future.

pick any date

Tuesday

Tuesday, October 27, 2026

Day of year

300 / 365

ISO week number

Days from today

Today

About this day of the week calculator

This tool tells you the day of the week for any date, from historical dates to future plans. It also shows the day of the year, the ISO week number and how many days the date is from today — handy for finding the weekday you were born on or checking which day a deadline lands on. Related tools: date calculator, week number, business days, age calculator.