Day of the Week for a Date
Enter any date and instantly find out which day of the week it is, which week of the year it falls in, and how many days have passed since then.
Date to check
Result
2026-10-23
viernes
Week 43 of 2026 · Day 296 of 365
It's today!
How to use: Day of the week
- 1Pick any date on the calendar.
- 2Read its weekday, ISO week number and day of the year.
- 3See how many days are left or have passed since today.
What is it for?
- Find out which weekday you were born on or your birthday falls on this year.
- Check whether a deadline lands on a weekend.
- Look up the week number for planning or payroll.
Which day of the week a date was or will be
Gregorian calendar
The current calendar was adopted in 1582 and has a leap year every four years, except century years not divisible by 400. That is why 2000 was a leap year and 1900 was not. The tool applies these rules to any date.
What it is useful for
Finding out which weekday you were born on, planning future events, checking whether a deadline falls on a weekend or verifying historical facts.
Week numbering
ISO 8601 starts the week on Monday and defines week 1 as the one containing the first Thursday of the year. In other countries the week starts on Sunday, which can shift week numbers at the turn of the year.
Related tools
Frequently asked questions
Does it work with far past dates?+
Yes. The tool supports any date from 1582 onward (Gregorian calendar).