Day of the Week

Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday


Nan

Show Hint
For a year 20XX:
Day code = (-1 + XX + roundup(XX / 4)) mod 7
Sunday = 0
Monday = 1
Tuesday = 2
Wednesday = 3
Thursday = 4
Friday = 5
Saturday = 6
Show Graphs

Performance

Overall
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday


Nan

Show Hint
Doomsdays:
Jan 3 (or 4 for leap years)
Feb 28 (or 29 for leap years)
3/14
4/4, 6/6, 8/8, 10/10, 12/12
5/9, 7/11, 9/5, 11/7
Show Graphs

Performance

Overall
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

Months

January
February
March
April
May
June
July
August
September
October
November
December

Leap Years

Leap Year
Not

About

This page was inspired as a way to test the methods to figure out the day of the week for any given way as shown in this video:

For more information, view https://en.wikipedia.org/wiki/Doomsday_rule