It is particularly useful for planning: knowing that a date lands on a Saturday prompts an automatic reschedule. Historical lookups use the Gregorian calendar, which is the standard for all modern dates. To find out whether the year itself was special, run it through the Leap Year Checker.
Calculator
How to use the Weekday Finder
- Pick the date you want to check.
- Read the weekday shown in the result panel.
- Use the week number and day-of-year values for planning.
- Check the anniversary table for future matches.
About this tool
The Weekday Finder is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Finding out which weekday a birthday or anniversary fell on.
- Scheduling meetings that avoid weekends.
- Checking the ISO week number for reporting.
- Verifying historical dates in research.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Which calendar is used?
The Gregorian calendar, which is the civil standard in almost every country today. Dates before its local adoption may differ by a few days.
How is the week number calculated?
Using the ISO-8601 rule: weeks start on Monday and week 1 is the first week containing a Thursday.
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