RAD Studio VCL Reference
SysUtils.IncAMonth Function

Increments date data by one month.

procedure IncAMonth(var Year: Word; var Month: Word; var Day: Word; NumberOfMonths: Integer = 1);
IncAMonth(Word Year, Word Month, Word Day, int NumberOfMonths = 1);

IncAMonth modifies Year, Month, and Day parameters so the date they describe is incremented by NumberOfMonths months. NumberOfMonths can be negative, to return a date N months previous. 

If the input day of month is greater than the last day of the resulting month, the day is set to the last day of the resulting month. 


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