However, to display negative numbers as negative dates, one needs to switch to the 1904 date system. Date before 1900 or after 9999 is identified as a text value by Excel.ĭates are stored only as positive integers in the 1900 date system. It is represented by the serial number 2958465. The last date recognized by Excel is December 31, 9999. Consequently, the number 2 represents January 2, 1900. This date is stored as the number 1 in Excel. In the 1900 date system, the first date that Excel recognizes is January 1, 1900. The reason dates are stored as serial numbers is to facilitate calculations. These numbers are known as serial values or serial numbers.
Both these systems store the dates as consecutive numbers having a difference of 1. Whereas, in Excel for Mac, 1904 is the default date system. In Excel for Windows, 1900 is the default date system.
We can change the date format in Excel either from the “Number Format” of the “Home” tab or the “Format Cells” option of the context menu. If the format is changed to d-mmm-yyyy, the date becomes. However, it is possible to change these default settings.įor example, the date corresponds to the format dd/mm/yyyy. The default date format is specified in the “Control Panel” of the system.
One can choose from the different formats available or create a customized format according to the requirement. In Excel, a date is displayed according to the format selected by the user.
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