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Increase a date with a certain amount of months
Source position: datih.inc line 130
procedure IncAMonth(  | 
var Year: Word;  | 
var Month: Word;  | 
var Day: Word;  | 
NumberOfMonths: Integer = 1  | 
);  | 
IncAMonth increases the date as specified by Year, Month, Day with NumberOfMonths. It takes care of the number of days in a month when calculating the result.
This function does the same as IncMonth, but operates on an already decoded date.
  | 
Increases the month in a TDateTime value with a given amount.  |