Written by Allen Wyatt (last updated April 19, 2025)
This tip applies to Excel 97, 2000, 2002, and 2003
Excel allows you to choose which arbitrary date you use as the beginning point for serial numbers. In the PC world, this date is January 1, 1900. If you are working with Excel workbooks imported from the Macintosh environment, however, you will want to set the starting date to January 2, 1904—the date used on the Mac.
To set which of these two dates is used, follow these steps:
Figure 1. The Calculation tab of the Options dialog box.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2413) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Changing Excel's Starting Date.
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