Day of the Week Calculator
Find the weekday for any date, plus its day of the year and ISO week number.
Runs entirely in your browser.
Find What Day of the Week a Date Falls On
About Day of the Week Calculator
This gives the weekday for any date, along with two numbers that often matter alongside it: the day of the year (1-366) and the ISO-8601 week number.
ISO weeks start on Monday, and week 1 is the week containing the first Thursday of January. That means the first days of January can belong to week 52 or 53 of the previous year - a detail worth knowing before you build reporting on week numbers.
Other Date Tools
- Date Calculator — difference, arithmetic and age on one page
- Age Calculator — exact age and days to the next birthday
- Date Difference — the span between two dates
- Add or Subtract Days — date arithmetic
- Leap Year Checker — is a year a leap year, and why
- Unix Timestamp — epoch seconds to and from a date
- Time Converter — seconds, minutes, hours, days, weeks
