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15 hours agoMy favorite is the fact that Microsoft intentionally left a bug in Excel that treats 1900 as a leap year when it wasn’t so they could maintain compatability with Lotus 1-2-3. And at this point fixing it would cause nearly every date value in excel files to display as off by one day and break a bunch of date formulas.
https://learn.microsoft.com/en-us/office/troubleshoot/excel/wrongly-assumes-1900-is-leap-year
This is also mine