Hi,
2 questions:
1) Are you calling FlexCelGrid.LoadSheet after the changes? you should always call LoadSheet after you change FlexCelImport.
2)How are you entering the "83:00" time with code?
I've tried with the following code:
procedure TForm16.FormCreate(Sender: TObject);
var
fmt: TFlxFormat;
begin
FlexCelImport1.NewFile();
FlexCelImport1.GetDefaultFormat(fmt);
fmt.Format := '[hh]:mm';
FlexCelImport1.CellValue[1,1] := 83 /24.0;
FlexCelImport1.CellFormat[1,1] := FlexCelImport1.AddFormat(fmt);
end;
And it seems to be working fine?