Mega Code Archive

Incmonth - increments a tdatetime variable by a number of months sysutils unit

function IncMonth ( const StartDate : TDateTime {; NumberOfMonths : Integer = 1} ) : TDateTime; Description The IncMonth function returns a TDateTime value that is NumberOfMonths greater than the passed StartDate value. The time component of the StartDate value is passed unchanged to the output value. The year value is incremented as appropriate. The increment value is optional, being 1 by default. After incrementing the month, if the day value is too high for that month/year, then it is reduced to the highest value for that month/year. Notes There is no DecMonth function. Instead, use IncMonth with a negative increment. Related commands IncDay Increments a TDateTime variable by + or - number of days IncMinute Increments a TDateTime variable by + or - number of minutes IncYear Increments a TDateTime variable by a number of years IncSecond Increments a TDateTime variable by + or - number of seconds IncMillisecond Increments a TDateTime variable by + or - number of milliseconds Example code : Add values to an example date var myDate : TDateTime; begin myDate := StrToDate('31/01/2000'); // End of Jan in a leap year ShowMessage('myDate = '+DateToStr(myDate)); // Increment by 1 (default) // 31st Jan 2000 ==> 31st Feb 2000 (illegal) ==> 29th Feb 2000 myDate := IncMonth(myDate); ShowMessage('myDate + 1 month = '+DateToStr(myDate)); // Increment by 12 months // 29th Feb 2000 ==> 29th Feb 2000 (illegal) ==> 28th Feb 2001 myDate := IncMonth(myDate, 12); // Increment by 12 months ShowMessage('myDate + 12 months = '+DateToStr(myDate)); end; Show full unit code myDate = 31/01/2000 myDate + 1 month = 29/02/2000 myDate + 12 months = 28/02/2001