Weekday Calculator
Calculated in your browser — we never store your dataVerified formulas with automated testing
📅
Date & Time
Try a historical date::
Monday, August 31, 2026 is a
Monday
Date Information
243
Day of Year
36
Week Number
122
Days Left in Year
No
Leap Year
All Mondays in August 2026
310172431
Days of the Week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
About the Calculation
- • • Uses the Gregorian calendar system
- • • Week numbers follow ISO 8601 standard (weeks start Monday)
- • • Leap years have 366 days, adding February 29
- • • Works for any date from year 1 to 9999