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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What adjustments would be necessary to have a remainder of 0 associated with Sunday?

I was reading this below and I had a question: http://mathforum.org/dr.math/faq/faq.calendar.html Take a look under "The Key Value Method" where it says "A remainder of 0 corresponds to Saturday, 1 ...
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55 views

Why do you subtract 1 in a leap year if the date falls before March?

I was reading this below and I had a question: http://mathforum.org/dr.math/faq/faq.calendar.html Take a look under "The Key Value Method" where it says "If your date is in January or February of a ...
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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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23 views

How can one manually calculate the date conversion to the Hebrew calendar

There already are algorithms that can be used to concert a date from different calendars into the Julian Day Number (JDN) and a JDN into the Hebrew calendar. But how can one calculate the conversion ...
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113 views

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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41 views

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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Calculate day from x position, when some spacer elements are used

Look at the following sketch: This should be a calendar view. In the beginning and the end of each week a 2 px separator is used (blue line). A week consists of seven days. Each day has a certain ...
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83 views

About an answer given for Project Euler 19

The problem is here and someone gave this answer but I don't understand it even if I know the rule of large numbers. If you want to write a code for this, it is really boring. On the other hand, ...
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184 views