The DATEDIF function is useful in formulas where you need to calculate an age. By default, Januis serial number 1, and Januis serial number 39448 because it is 39,447 days after January 1, 1900. The years of the dates are ignored.ĭates are stored as sequential serial numbers so they can be used in calculations. The difference between the days of start_date and end_date. The days and years of the dates are ignored The difference between the months in start_date and end_date. Important: We don't recommend using the 'MD' argument, as there are known limitations with it. The months and years of the dates are ignored. The difference between the days in start_date and end_date. The number of complete months in the period.

The number of complete years in the period. The type of information that you want returned, where:

Dates may be entered as text strings within quotation marks (for example, '0'), as serial numbers (for example, 36921, which represents January 30, 2001, if you're using the 1900 date system), or as the results of other formulas or functions (for example, DATEVALUE('0')).Ī date that represents the last, or ending, date of the period. SyntaxĪ date that represents the first, or starting date of a given period.

Please see the known issues section of this article for further details. The DATEDIF function may calculate incorrect results under certain scenarios. Warning: Excel provides the DATEDIF function in order to support older workbooks from Lotus 1-2-3.

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