What Day of the Week Was It Calculator
What Day Was This Date?
Find the day of the week for any date
Formula
Day of Week = Date mod 7 (using Gregorian calendar)
Frequently Asked Questions
What day of the week was I born?
Enter your birth year, month, and day into the calculator to instantly see what day of the week you were born on.
How does the calculator determine the day of the week?
The calculator uses the Gregorian calendar system. It correctly handles leap years and all date ranges to determine the exact day of the week.
What is ISO week numbering?
ISO 8601 defines week 1 as the week containing the first Thursday of the year. Weeks start on Monday. This means week 1 always contains January 4.
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