Leap year bug

Version 4.x, 95 – We recently ran a tip describing 1900 as a leap year. Quite a few of you noticed that it was not–among them, T. P. and P. P. Congratulations! This fact has escaped Microsoft through at least three versions of Excel.

Leap years occur in every year that is exactly divisible by four, except when the year is also exactly divisible by 100 (an even century year). And these years are leap years only if they are exactly divisible by 400. Therefore, 2000 will be a leap year, since 2000 divided by 4 equals 500 and 2000 divided by 400 equals 5. However, since 1900 divided by 400 equals 4.75, it wasn’t a leap year. Treating 1900 as a leap year is definitely a bug in the versions of Excel shipped with Office 4.x, Office 95, and Office 97.

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You can also tell when the date is incorrect if you attempt to change the cell format to another date type. For example, enter 2/29/97. Now click in the cell and choose Format, Cells and select Date. Then choose a new date format and click on OK. If the date is incorrect, the cell won’t accept the new format. If the date is correct, the format will change.

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