Excel for Mac, like all Macintosh applications, uses the 1904 date system to store dates in worksheets. Excel for Windows ...

Excel for Mac, like all Macintosh applications, uses the 1904 date system to store dates in worksheets.  Excel for Windows uses a different date system called the 1900 date system.  Normally, each version of Excel automatically adjusts to use the correct date system.  But, if you copied these dates from a worksheet created by Excel for Windows, the dates might appear off by as much as 4 years.  For more information, click Help.
English
English (United States)
Deutsch (Deutschland)
German (Germany)
Español (España)
Spanish (Spain)
Français (France)
French (France)
italiano
Italian
日本語
Japanese