Under Category, click Date, select the date format you want, and then click OK. Press Ctrl+1 to launch the Format Cells dialog, and click the Number tab. If your results appear as serial numbers, select the cells in question and continue with the following steps: By default, Januis serial number 1, and Januis serial number 40179 because it is 40,178 days after January 1, 1900. For example, might be displayed as 43504.Įxcel stores dates as sequential serial numbers so that they can be used in calculations. 1).Įnter =EDATE(A2,B2) in cell C2, and copy down as needed.ĭepending on the format of the cells that contain the formulas that you entered, Excel might display the results as serial numbers. To indicate if a month should be subtracted, you can enter a minus sign (-) before the number (e.g. For example, =EDATE("9/15/19",-5) returns 4 /15/19.įor this example, you can enter your starting dates in column A.Įnter the number of months to add or subtract in column B. To subtract months, enter a negative number as the second argument. The EDATE function requires two arguments: the start date and the number of months that you want to add or subtract. You can use the EDATE function to quickly add or subtract months from a date. In cell C2, enter =A2+B2, and copy down as needed.Īdd or subtract months from a date with the EDATE function You can enter a negative number to subtract days from your start date, and a positive number to add to your date. In the following example, you'll see how to add and subtract dates by entering positive or negative numbers.Įnter the number of days to add or subtract in column B. You want to transfer funds to your checking account so that those funds arrive 15 calendar days before that date, so you'll subtract 15 days from the due date. Here's a good link on Khan Academy that explains more about modulo.Suppose that a bill of yours is due on the second Friday of each month. (In this way, the MOD function works a bit like a clock. The MOD function takes care of the negative problem by "flipping" negative values to the required positive value. For example, to calculate hours between 9 PM and 3 AM: =MOD(0.125-0.875,1)*24 One elegant way to handle this challenge is to add the MOD function to the formula. When times cross midnight, the problem becomes more tricky, since the end time will often be less than the start time. For example, with start time of 9:00 AM and an end time of 3:00 PM, you can simply use this formula: =(3:00 PM-9:00 AM)*24 To calculate hours between times, you can simply subtract the start time from the end time when both times are in the same day. To convert these fractional values to decimal hours, just multiply by 24. In other words, Excel times are just fractional numbers: Time Excel dates are serial numbers, and a day is equivalent to the number 1.
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