Questions tagged [calendar-computations]
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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Number of 1st Jan Sundays between year a and b.
Given two year number a and b (eg a=1000 b=2000). Find the number of 1st January Sundays? Given 1st Jan 2001 was Monday?
I figured that day sequence repeat after 28 years. But produced wrong answer. ...
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A leap year X has exactly the same calendar as another leap year Y. What can be the absolute difference between the values of X and Y?
A leap year X has exactly the same calendar as another leap year Y. What can be the absolute difference between the values of X and Y?
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All of these
How can we find which leap year will have ...
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Finding the day of the same date of previous month?
I wanted to know if there was a short way that I could determine the day which would have been for a given date.
For example, looking at the date today 4/3/17. Is there anyway we can easily ...
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Determine the busiest day from a list of dates.
There are N date ranges which include check-in date and check-out date. How can I find out the busiest day?
Example:
...
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Mean number of days in a Gregorian month
Across the Gregorian calendar, what's the arithmetic mean of the number of days in each month?
The context for this question is that I have some survey data in which people were asked how many times ...
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Regarding Days and Week in Calendar [closed]
How to find the Particular day for 27 -1-1932, can anyone solve the Problem, how to study the Day for particular calendar events
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Smallest future date which involves no repetition of a digit in the format DD/MM/YYYY [closed]
What is the smallest future date which involves no repetition of a digit in the format DD/MM/YYYY for the year? What is your approach?
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Why isn't 1900 a leap year? [closed]
I searched leap years online and found that 1900 is not, contrary to what I thought, a leap year. But, why is it not if 1900 is divisible by 4:
$\frac{1900}{4} = 475$
My brother was working on his ...
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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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Can there be a month with 6 Mondays? (or 6 of any other days?)
This year, this month (November) we've 5 Mondays so I get 5 pay checks on 2nd, 9th, 15th, 22nd, 29th (which feels very good - I get paid one extra check :-).
I wonder if it's possible some years to ...
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Is it possible to have such date and day combination that doesn't occur on any year ever?
My friend told me a story yesterday and said "It happened on March 13th and it was Friday".
I was thinking about this and I've a question. Is it possible to have such date and day combination that it ...
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perpetual calendar on five dice
Does anyone know how to create a perpetual calendar on the sides of five dice ?
The calendar is required to show just two digit day, and three letter month name.
Apparently this can be done using ...
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how to determine particular months with five weekends
January of 2016 has five Fridays, five Saturdays and five Sundays. What is the next January that will again have five weekends like this?
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Months and notes. Pure coincidence?
There are $12$ months in a year and $12$ notes in the chromatic scale. Moreover, there are $7$ long and $5$ short months and there are $7$ white and $5$ black keys in each octave on the piano ...
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Friday the 13th future possible
A year normally has at most three Fridays the 13th. Year 2015 has three such days. What is the next year that has three Fridays the 13th again for the first time?
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