This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Yes No. Kevin I disagree. You seem to argue about details of the algorithm which in my opinion are not that important. At the very least it provides a lot of useful information about other calendars etc.
I meant a terrible programming resource. The algorithm posted at Wikipedia is unvetted and subject to change and has been outright incorrect at times. I believe the details of the algorithm are overwhelmingly important.
Leap Year bugs have taken down numerous systems and cost millions and millions of dollars. I'm a fan of details. And you have to consider more than the leap-year-algorithm when considering leap-year-bugs. In general terms the algorithm for calculating a leap year is as follows Ivan Prodanov Ivan Prodanov Yuankun 5, 2 2 gold badges 27 27 silver badges 33 33 bronze badges. Theodore Zographos Theodore Zographos 1, 19 19 silver badges 21 21 bronze badges.
Hope that helps. Brad Brad 61 1 1 silver badge 2 2 bronze badges. This is less efficient than an if statement. You are forcing two comparisons in every case even when one will suffice. You really should try to google first.
Davy Landman Davy Landman PeterM web. By the way, it seems, Google developers are too cool to read Wikipedia: github. In a minor twist, this post is now pretty high in Google's search ranking, haha. Assuming every year as no leap year, the length of the year will come Sandeep Agrawal Sandeep Agrawal 11 2 2 bronze badges. So, the rules are, in decreasing priority: multiple of is a leap year.
Finn Jensen Finn Jensen 1. The next time a year is divisible by would be in the year And we just don't care what happens if and when we get there. Balaji Balaji 51 2 2 bronze badges. In the Gregorian calendar 3 criteria must be taken into account to identify leap years: The year is evenly divisible by 4; If the year can be evenly divided by , it is NOT a leap year, unless; The year is also evenly divisible by Then it is a leap year.
Why the year divided by is not leap year. Milon Milon 21 1 1 bronze badge. Python 3. Samuel Samuel 4 4 silver badges 21 21 bronze badges. This is the most efficient way, I think. Mikha'el Wade Mikha'el Wade 1. Community Bot 1 1 1 silver badge. Etnic Etnic 21 1 1 silver badge 6 6 bronze badges. In the Julian calendar, leap years are divisible by 4 while in the Gregorian calendar, leap years are either of the following: Divisible by Divisible by 4 and not divisible by It takes Earth approximately This is called a tropical year , and it starts on the March equinox.
However, the Gregorian calendar has only days in a year. If we didn't add a leap day on February 29 almost every four years, each calendar year would begin about 6 hours before the Earth completes its revolution around the Sun see illustration.
As a consequence, our time reckoning would slowly drift apart from the tropical year and get increasingly out of sync with the seasons. With a deviation of approximately 6 hours per year, the seasons would shift by about 24 calendar days within years. Allow this to happen for a while, and Northern Hemisphere dwellers will be celebrating Christmas in the middle of summer in a matter of a few centuries.
Leap days fix that error by giving Earth the additional time it needs to complete a full circle around the Sun. Exact timings for spring, summer, fall, and winter. To check if a year is a leap year, divide the year by 4. If it is fully divisible by 4, it is a leap year. For example, the year is divisible 4, so it is a leap year, whereas, is not. However, Century years like , , , need to be divided by to check whether they are leap years or not.
Leap Year Calculator A leap year calculator is a free online tool which calculates and checks whether a given year is a leap year or not.
0コメント