Hi,

This is actually not very easy to do in a reliable way.

One very simple way to do it would be like this:

        
        private void ultraGrid1_BeforeExitEditMode(object sender, Infragistics.Win.UltraWinGrid.BeforeExitEditModeEventArgs e)
        {
            var grid = (UltraGrid)sender;
            UltraGridCell activeCell = grid.ActiveCell;

            if (activeCell.Column.Key == "DateTime 1")
            {
                string cellText = activeCell.Text;
                if (cellText.EndsWith("__:__ __"))
                {                    
                    cellText = cellText.Substring(0, cellText.Length - "__:__ __".Length);
                    DateTime newDateTime;
                    bool success = DateTime.TryParse(cellText, out newDateTime);
                    if (success)
                        activeCell.EditorResolved.Value = newDateTime;
                }
            }
        }

So this code explicitly looks to see if the Time portion of the DateTime is empty and if so, parses a date based solely on the Date portion of the text.

But this code is flawed because it doesn't account for culture. I've hard-coded it to work with the culture on my machine. On my machine, "{date} {time}" returns a date with a 4-digit year and a time format with an colon and an AM/PM symbol. But this might vary on other machine which are set to different cultures. So the right thing to do would be to use the current culture to get the property strings and string lengths. Unfortunately, this is not simple and the DateTime editor doesn't use the system settings directly when you use "{time}" - it modifies the format slightly to provide 2 digits for the hour in the mask.

So the code I have here will work in a simple case as long as the culture is the same on all machines running you application. Otherwise, I don't see any way to achieve what you want.