I double checked here and, actually, it is only possible to have tasks with DateTime as start while editing on the Gantt Plugin. But this is not saved anywhere, because the field type is Date. When I open the project again on the Gantt plugin, I see that the task time is reset to 12AM. So it does not get saved. I'll propose having DateTime fields as an improvement.
Thanks!
I know this is an old thread, but this is exactly the issue I am encountering. The template field is locked as Date so you are unable to change it to Date/Time. Did you ever work get a work around?
