Learn how to figure out dates using formulas in Excel What dates mean to Excel There’s a difference between what dates mean to you and what they mean to.

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Learn how to figure out dates using formulas in Excel What dates mean to Excel There’s a difference between what dates mean to you and what they mean to Excel. To you, 8/22/2010 is a month, day, and year. To Excel, 8/22/2010 is serial number In this lesson you’ll learn how Excel’s view of dates makes it possible to do date arithmetic, and how to enter dates in a format that Excel can understand.

Learn how to figure out dates using formulas in Excel The calendar starts in 1900 Dates are stored in Excel as serial numbers starting with 1, which represents January 1, That’s when the Excel calendar starts. Each day after that adds one number to the sequence. For example, January 2, 1900 is stored as 2. That means if you type 8/22/2010, Excel stores the date as — or days from January 1, 1900.

Learn how to figure out dates using formulas in Excel The calendar starts in 1900 Storing dates as serial numbers makes it possible for Excel to do date arithmetic. To find the number of days between two dates, for example, Excel subtracts one serial number from another.

Learn how to figure out dates using formulas in Excel How Excel recognizes dates Whether you type 8/22/2010, 22-Aug- 2010, or even August 22, 2010, it’s all stored as serial number The exception is if you use a format that Excel doesn’t recognize as a date. For example, if you typed August-22,2010 or 8,22,10, Excel would store that information as plain text, not a serial number.

Learn how to figure out dates using formulas in Excel How Excel recognizes dates Here’s how you can change the format—or see some of the other ways you can use slashes or hyphens to format dates. Select Date in the Category list. Select a date format in the Type list. Right-click a cell with a date in it, and choose Format Cells. Then you can: