Code:

{

Data sometimes have to be filtered regarding to working

days (Mo.-Fri.) of the current Week. Following procs set

your TDateTimePicker automatically.

}

function GetMonday(RefDay: TDate): TDate;

var

DoW: Integer;

DateOffset: Integer;

begin

DoW := DayOfWeek(RefDay);

// Montag der Woche

if DoW = 1 then DateOffset := -6

else

   DateOffset := Dow - 2;

Result := RefDay - DateOffset;

end;

function GetFriday(RefDay: TDate): TDate;

var

DoW: Integer;

DateOffset: Integer;

begin

DoW := DayOfWeek(RefDay);

    {

    Friday of current week

    Freitag der Woche

    }

if DoW = 1 then DateOffset := -2

else

   DateOffset := Dow - 6;

Result := RefDay - DateOffset;

end;

procedure SetWorkingDaysFilter(S, E: TDateTimePicker);

var

N: TDate;

begin

N      := Now;

S.Date := GetMonday(N);

E.Date := GetFriday(N);

end;

{Just as short as simple}

{Einfach und kurz}

type

TForm1 = class(TForm)

   DStart: TDateTimePicker;

   DEnd: TDateTimePicker;

   btSetFilter: TButton;

   procedure btSetFilterClick(Sender: TObject);

end;

procedure TForm1.btSetFilterClick(Sender: TObject);

begin

SetWorkingDaysFilter(DStart, DEnd);

end;