SubtractQuarters Function
Subtracts a Floating Point amount of Quarters from a Given Date/Time.

Unit
QESBPCSDateTime

Declaration
Function SubtractQuarters(const DT: TDateTime; const Qtrs: Extended): TDateTime;

Description
Fractional portion of Quarter is assumed to be related to 30 day month, as the AddMonths routine is used. Time portion preserved.

If Subtracting Quarters results in landing on a nonsense date like 31 Apr then the last day in the month is used. This only applies to the integral component of the Quarter Subtracted. The fractional part always is Subtracted from the resultant Date/Time.

Parameters
DT Date/Time to process.
Qtrs Number of Quarters to Subtract - can be negative.

Category
Date/Time Arithmetic Routines

Implementation

function SubtractQuarters (const DT: TDateTime; const Qtrs: Extended): TDateTime;
begin
     Result := AddMonths (DT, Qtrs * -3);
End;


HTML generated by Time2HELP
http://www.time2help.com