Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Calculating the Day of the Year.
You've probably seen it on calendars before—some include an indication that "Today is the 123 day of the year with 242 remaining." You can easily calculate the day number of a year, as well as how many are remaining. For instance, let's assume you have a date in cell D27. You could use the following formulas to calculate, respectively, what day of the year it is and how many are still left:
=D27-"12/31/2008" ="12/31/2009"-D27
The reason that the first formula uses a date of 12/31/2008 is so the result will show the actual day number. Using these formulas, the result of 1/1/2009 in cell D27 would result in 1, meaning it is the first day of the year. (This is as it should be.)
Of course, once you enter the formulas, you need to format the cells as regular numbers. (Excel will, by default, try to format the cells as dates.) With the two cells selected, follow these steps:
Figure 1. The Number tab of the Format Cells dialog box.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2931) 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: Calculating the Day of the Year.
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Please Note:
This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: 
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