Dev Tools

Weekday Finder

Enter any date to find the day of the week, ISO week number, day-of-year, and what day January 1 falls on.

Select a date
Results
Day of week
Wednesday
Day of year
56 of 365
ISO week number
Week 9
Jan 1, 2026 falls on
Thursday
Leap year
No
Formatted date
Wednesday, February 25, 2026
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