IncMonth

Returns a numerical value corresponding to a Julian date that is after or before the specified Julian date by a specified number of calendar months.

Julian Date indicates the number of days that have elapsed since January 1st, 1900.

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Example

IncMonth(39417,1) will return a value of 39448, corresponding to January 1st, 2008, one calendar 
month after the specified date of December 1st, 2007 

IncMonth(36252,-2) will return a value of 36193, corresponding to February 2nd, 1999, two calendar
months before the specified date of April 2nd, 1999