empty the timeedit field in grid when create a new grid lines

I have a Field in Grid for Checkin time…When I Create a new record, create a default value 12:00:00 am in that field…How to set empty this field when create a new grid lines …?

Time use your format defined in Windows, therefore the default time is 00:00:00, 12:00:00 am or so. AX doesn’t know anything like “null time”; the fields always has some value.