Light Dark. Carlos Delgado May 14, 5. Share this article. Carlos Delgado Author. Add Your Comment. Become a more social person. Related Articles. How to determine if the year of a date is leap in MomentJS April 07, 4. How to determine whether a year is leap or not in programming March 14, 4. How to determine the screen refresh rate in Hz of the monitor with JavaScript in the browser December 02, 5.
How to retrieve the closest word in a string with a given index in Javascript July 29, 7. It goes like this: Let k be the day of the month. Let m be the month, counting March as 1 and February as Here January and February are considered as the last months of the preceding year. This is to make Feb. Let D be the last two digits of the year. Let C be the first two digits of the year the century. For any real number x, let [x] be the greatest integer less than or equal to x , which you get by truncating any fractional part.
This rule was given by a certain Rev. Zeller, and so is called Zeller's Rule. This works for the Gregorian calendar only. There is a simpler version for the Julian calendar. Recall that English-speaking countries used the Gregorian calendar beginning 14 Sep , and before that used the Julian calendar.
Just the FAQ, please This formula is given a little more fully in the FAQ which uses a better example, and was edited a couple times over the years as we found that the original version was misstated, misinterpreted, or misapplied by readers. This makes the formula simpler, because on leap years February 29 is counted as the last day of the year.
Because of this rule, January and February are always counted as the 11th and 12th months of the previous year. D is the last two digits of the year. Once we have found f, we divide it by 7 and take the remainder. I plugged in all the correct information into Zeller's Formula and I checked my answer against an actual calendar and my answer was wrong.
I know for sure that I solved the formula correctly, following all the rules associated with Zeller's Rule, however the outcome was wrong. Any help you have would be much appreciated. Thank You! I replied: The last couple steps of your work can't be right. Your value for f is much too large, and the remainder when you divide by 7 can't be greater than 6! One way to get a remainder on a calculator is to first round down the quotient How does it work?
Here is a question from Deriving Zeller's Rule I am doing a report on the formula for the day of the week for any day, but I cannot completely figure out how to derive it. Having fully stated the theorem, we can prove it. Where does this come from? Let's first note the reason for the odd handling of months: we want leap day not to affect the formula, so we move it to the end of the 'year', and act as if the year began on March 1. WriteLine "Wednesday" ; break ; case 5 : Console.
WriteLine "Thursday" ; break ; case 6 : Console. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Skip to content. Change Language. Related Articles. Table of Contents. Save Article. Improve Article. Like Article. Python3 program to find Find the Day.
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