This tag is for questions about combinatorial and computational issues with regards to calendar systems. A typical, well-known mathematical result in this direction is John Conway's Doomsday Algorithm for computing the "day of the week" associated to a given date.

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4-4-5 retail calendar - calculating extra week

I have been tasked with making a 4-4-5 calendar for a retail reporting system (in javascript using moment.js but this shouldn't matter). http://en.wikipedia.org/wiki/4-4-5_calendar A 52 week year is ...
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Why this formula counts passed leap years in Persian arithmetic calendar?

I was reading about a calendar system with these characteristics: Years are grouped into cycles which begin with four normal years after which every fourth subsequent year in the cycle is a leap ...
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Question about Gauss' Determination of the first day of the year.

On the wikipedia article http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week#Gauss.27_algorithm it explains the Gaussian Formula for calculating the first day of the year. I was ...
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Get number of week by given date and day of week

Is there a formula to get the number of week by a given date and day of week for example Oct 15, 2014 wed. how do i get what number of week is it?
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Find the datetime that is the true corresponding time to a calendar time in another year accounting for leap year

I want to make averages from values recorded on the hour. Because of leap time and the gregorian calendar, March 1st 12pm is not really the same point in earth's year when comparing this year with any ...
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Intuition behind Gauss' Easter Sunday formula?

Easter Sunday is the first Sunday after the first full moon of spring. Given just the year, Gauss was able to derive a formula which gave you the month and day that easter sunday fell on. The formula ...
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75 views