Find the correct weekday number for a weekday
Is the given year a leap year?
Find the doomsday for a given month in a non-leap year
Find the doomsday for a given month and year
Find the correct anchor day for a given century
How many times can we divide the given number by 12
Find the remainder after dividing by 12s
How many times can we divide the given number by 4
Find the modulo 7 of the sum of the modulo 12 and its divisor of 4
Find the correct doomsday for the given year
Find the day of the week for the given date