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I went to the year 4000 AD in iOS Calendar and according to the app that year is a normal year. Normally 4000 AD is a leap year. Calendar should be wrong.

iPhone XS, iOS 13

Posted on Apr 23, 2020 6:33 AM

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14 replies

Apr 23, 2020 9:09 AM in response to alper182

No, 4000 is a leap year. The rule is a year that is evenly divisible by 4 is a leap year, unless it is evenly divisible by 100, except if it is evenly divisible by 400. 4000 is divisible by 400. Just as 2000 was a leap year, but 2100 will not be.


It’s usually called the 4 - 100 - 400 rule. Of course, by 4000 we will be using the stardate calendar, anyway.

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