Day of the Week & Leap Year Checker
Find the exact day of the week for any historical or future date and check leap years.
Day of the Week & Leap Year Checker
Find the exact day of the week for any historical or future date and check leap years
How to Use Day of the Week & Leap Year Checker
1. Select Any Calendar Date
Choose any past, present, or future date using the date picker or input fields.
2. Instant Day Calculation
Computes the exact day of the week (e.g., Saturday) using Zeller's congruence algorithm.
3. Explore Historical Context
View leap year status, day of the year number, week number, and elapsed days from today.
How This Utility Works
Historical and future calendar diagnostic tool. Determines the exact day of the week for any date, day of the year (1-366), ISO week of the year, and astronomical leap year status.
Timezone projections and Unix epoch calculations run against your local device clock and internationalization tables without network polling.
Frequently Asked Questions
How does it determine leap years?
Using the Gregorian calendar rule: years divisible by 4, except century years unless divisible by 400.