Title: See as returning the difference of days and hours among two dates.
Question: how to make calculations the difference of days and hours among two dates?
Answer:
procedure TForm1.Button1Click(Sender: TObject);
begin
Calc_Dia_Hora(Dia, Hora, StrToDateTime(MaskEdit1.Text), StrToDateTime(MaskEdit2.TExt));
Label1.Caption := Total of Days...: + Dia;//day
Label2.Caption := Total of hours..: + Hora;//hour
end;
procedure Calc_Dia_Hora(var ResDia, ResHora: String; DiaHoraIn, DiaHoraFin: TDateTime);
var
DHI, DHF: String;
DiaI, DiaF, HoraI, HoraF: String;
begin
DHI := DateTimeToStr(DiaHoraIn);
DHF := DateTimeToStr(DiaHoraFin);
DiaI := Copy(DHI, 1,8);
DiaF := Copy(DHF, 1,8);
HoraI := Copy(DHI, 10,5);
HoraF := Copy(DHF, 10,5);
if (DiaHoraIn begin
if (StrToTime(HoraI) begin
ResDia := FloatToStr(StrToDateTime(DiaF) - StrToDateTime(DiaI));
ResHora := TimeToStr(StrToTime(HoraF) - StrToTime(HoraI));
end
else
begin
ResDia := FloatToStr(StrToDateTime(DiaF) - StrToDateTime(DiaI) -1);
ResHora := TimeToStr(StrToTime(HoraF) - StrToTime(HoraI)+ 24);
end;
end
else
ShowMessage(The final Date cannot be smaller than dates initial...!);
end;