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In your Excel worksheet, the formulas may look as follows: 1  To add years to a date in Excel: =DATE(YEAR(A2) + 5, MONTH(A2), DAY(A2)) The formula adds 5 years to the date in cell A2. 2  To subtract years from a date in Excel: =DATE(YEAR(A2) - 5, MONTH(A2), DAY(A2)) The formula subtracts 5 years from the date in cell A2.
To subtract a number of months or years to a date, you first need to decompose the initial date into its year, month, and day components, subtract the desired offset, and then let Excel put the components back together. For example, say you have a date in A1, to which you want to subtract 3 months and 4 days.or example, adding 6 months and 10 days to 8/25/97, in A1 with the formula. =DATE(YEAR(A1),MONTH(A1)+6, DAY(A1)+10). Generally, you cannot add two dates that are in serial format. For example, adding 1/15/1998 and 6/15/1998 gives 6/30/2096, which is essentially meaningless.