When you enter a date, it is converted into a serial number that represents the number of days elapsed since January 1, 1904. In the 1904 date system, dates are calculated by using January 1, 1904, as a starting point. If you choose to convert the pasted data, Excel adjusts the underlying values, and the pasted dates match the dates that you copied.
This is the default date system in Excel for Windows, Excel 2016 for Mac, and Excel for Mac 2011. For example, if you enter July 5, 2011, Excel converts the date to the serial number 40729. When you enter a date, it is converted into a serial number that represents the number of days elapsed since January 1, 1900. In the 1900 date system, dates are calculated by using January 1, 1900, as a starting point. Note: Dates that are copied as part of a chart cannot be converted from the 1904 date system and will vary by approximately four years. Or, you can keep the 1904 date system for the pasted dates only. This option makes the dates compatible with other dates in the workbook. You can convert the dates to use the 1900 date system (recommended). If this option is disabled, you will receive a message asking whether the dates should be converted when pasted. When you copy dates from a workbook created in an earlier version to a workbook created in Excel 2016 or 2011 for Mac, they will be converted automatically unless the option to "Automatically convert date system" is disabled in Preferences > Edit > Date Options. Excel 2016 for Mac and Excel for Mac 2011 use the 1900 date system, which guarantees date compatibility with Excel for Windows. Excel 2008 for Mac and earlier Excel for Mac versions calculate dates based on the 1904 date system. All versions of Excel for Windows calculate dates based on the 1900 date system. Each date system uses a unique starting date from which all other workbook dates are calculated. LessĮxcel supports two date systems, the 1900 date system and the 1904 date system. Excel for Microsoft 365 Excel for Microsoft 365 for Mac Excel 2021 Excel 2021 for Mac Excel 2019 Excel 2019 for Mac Excel 2016 Excel 2016 for Mac Excel 2013 Excel 2010 Excel 2007 Excel for Mac 2011 More.
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