Weekday Calculator
Calculated in your browser — we never store your dataVerified formulas with automated testing
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Date & Time
Try a historical date::
Friday, July 17, 2026 is a
Friday
Date Information
198
Day of Year
29
Week Number
167
Days Left in Year
No
Leap Year
All Fridays in July 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
Sources & Methodology
Formula:
Zeller's Congruence or Julian Day algorithmDay of week calculation
Source: Gregorian calendar algorithm
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