Iniciar DateTimePicker en primer día del mes

[ContraVeneno]

Código Delphi [-]
var
  Present: TDateTime;
  Year, Month, Day, Hour, Min, Sec, MSec, Days: Word;
 begin
  Present:= Now;
  DecodeDate(Present, Year, Month, Day);
  dtpIni.DateTime:=EncodeDate(Year,Month,1);
  dtpFin.DateTime:= dtpIni.DateTime+DaysInAMonth(Year, Month);
  //o tambien
  dtpFin.DateTime:= DecodeDate(Present, Year, Month, DaysInAMonth(Year, Month);

---edit
Que rapidez amigo Jhonny