Excel incorrectly assumes that the year 1900 is a leap year(docs.microsoft.com)
docs.microsoft.com
Excel incorrectly assumes that the year 1900 is a leap year
https://docs.microsoft.com/en-us/office/troubleshoot/excel/wrongly-assumes-1900-is-leap-year
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Obligatory link to "My First BillG Review" by Joel Spolsky: https://www.joelonsoftware.com/2006/06/16/my-first-billg-rev...