| OptDate2Month Function |
Unit
QESBPCSDateTime
Declaration
Function OptDate2Month(const DT: TDateTime): Word;
Category
Date/Time Conversion RoutinesImplementation
function OptDate2Month (const DT: TDateTime): Word;
var
J: Integer;
Day, Month, Year: Integer;
begin
J := pred ((Trunc (DT) + 693900) shl 2);
Year := J div 146097;
Day := (J - 146097 * Year) shr 2;
J := (Day shl 2 + 3) div 1461;
Day := (Day shl 2 + 7 - 1461 * J) shr 2;
Month := (5 * Day - 3) div 153;
if Month < 10 then
Inc (Month, 3)
else
Dec (Month, 9);
Result := Month
End; |
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