procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
I : Integer;
begin
I := Length(TEdit(Sender).Text);
case Key of
#8 : Inherited;
else
begin
if Key in ['0'..'9'] then
begin
if I = 8 then Key := #0; case I of
0 : if not (Key in ['0'..'2']) then Key := #0;
1 :
begin
if Key in ['0'..'4'] then
begin
TEdit(Sender).Text := TEdit(Sender).Text + Key + ':';
Key := #0;
TEdit(Sender).SelStart := 3;
end else
Key := #0;
end;
3 : if not(Key in ['0'..'5']) then Key := #0;
4 :
begin
TEdit(Sender).Text := TEdit(Sender).Text + Key + ':';
Key := #0;
TEdit(Sender).SelStart := 6;
end;
6 : if not(Key in ['0'..'5']) then Key := #0;
end;
end else
Key := #0;
end;
end;
end;
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