Formula Method Open your spreadsheet in Microsoft Excel and locate the date you wish to increment by one month.

Formula Method The most obvious way to increment a number in Excel is to add a value to it. Start with any value in cell A1, and enter "=A1+1" in cell A2 to increment the starting value by one.

Save time and effort by learning how to use the TIME() function in Excel to enter a series of incremental times in this step-by-step guide.