Day of Week Finder
The day of week finder tells you which weekday any date falls on. Enter any past or future date and instantly see the day name, ISO week number, and day of the year.
Perfect for planning events, checking historical dates, or satisfying your curiosity about what day of the week a particular date was or will be.
How it works
The weekday is determined using JavaScript's Date object. The ISO week number is calculated per ISO 8601: the week containing the year's first Thursday is week 1. Day of year = days elapsed since January 1.
Use cases
- Finding out what day of the week you were born
- Planning events on a specific weekday
- Checking historical dates and their weekdays
- Determining week numbers for project planning