freepascal.ru

Код: Выделить всё

  TDateTime           = type Double;
  TDate               = type TDateTime;
  TTime               = type TDateTime;

Код: Выделить всё

Function TryEncodeDate(Year,Month,Day : Word; Out Date : TDateTime) : Boolean;

var
  c, ya: cardinal;
begin
  Result:=(Year>0) and (Year<10000) and
          (Month in [1..12]) and
          (Day>0) and (Day<=MonthDays[IsleapYear(Year),Month]);
 If Result then
   begin
     if month > 2 then
      Dec(Month,3)
     else
      begin
        Inc(Month,9);
        Dec(Year);
      end;
     c:= Year DIV 100;
     ya:= Year - 100*c;
     Date := (146097*c) SHR 2 + (1461*ya) SHR 2 + (153*cardinal(Month)+2) DIV 5 + cardinal(Day);
     // Note that this line can't be part of the line above, since TDateTime is
     // signed and c and ya are not
     Date := Date - 693900;
   end
end;

function TryEncodeTime(Hour, Min, Sec, MSec:word; Out Time : TDateTime) : boolean;

begin
  Result:=(Hour<24) and (Min<60) and (Sec<60) and (MSec<1000);
  If Result then
    Time:=TDateTime(cardinal(Hour)*3600000+cardinal(Min)*60000+cardinal(Sec)*1000+MSec)/MSecsPerDay;
end;