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Weekday and day-of-year
Time and date
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About this tool
Find a date’s weekday, Monday-based weekday number, and ordinal day within its year.
Common uses
- Find a date’s weekday, Monday-based weekday number, and ordinal day within its year.
- Choose the calendar date to inspect.
How to use it
- 1.Choose the calendar date to inspect.
- 2.Read its weekday number from 1 for Monday to 7 for Sunday, and its day number out of 365 or 366.
Limits and notes
- This is a calendar-day lookup, not an ISO week-number calculation; supported input years are 0001–9999.
Frequently asked questions
What does this tool do?
Find a date’s weekday, Monday-based weekday number, and ordinal day within its year.
What should I check before using the result?
This is a calendar-day lookup, not an ISO week-number calculation; supported input years are 0001–9999.