has a date serial number of 1.Ĭaution! Excel dates after 28th February 1900 are actually one day out. The integer portion of the date serial number represents the day, and the decimal portion is the time. If you change the cell format to 'General' you'll see the underlying date serial number. When you look at a date in Excel it's actually a regular number that has been formatted to look like a date. Excel Date and Time 101 In a nutshellĮxcel stores dates and time as a number known as the date serial number, or date-time serial number. You can see an example in the Format Cells dialog box below: mm/dd/yyyy.ĭates and times with a format that begins with an asterisk (*) automatically update based on your PC’s regional settings. However, if you open the accompanying Excel file you may see some dates have switched to match your regional settings, which may be different to mine e.g. When reading this post keep in mind that my regional settings format dates as dd/mm/yyyy and so the screenshots throughout this post are in this format. Note: This is a zip file including an Excel workbook with detailed instructions and a PDF version for your reference. Excel for Decision Making Under Uncertainty Courseĭownload the Excel Workbook and PDF.
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