>>HOW CAN I USE JUST THE TIME PORTION OF DATETIME() IN A GRID COLUMN, WHICH CONTROLSOURCE IS A FIELD WITH DATETIME FORMAT?
>
>For display only, you could use the TTOC() function with the ,2 optional parameter rather than the raw field, but that doesn't solve anything if you're entering data there.

I wonder if you could try the following snippet in the GotFocus method:
if set('century')="ON"
this.selstart=10
else
this.selstart=8
endif
nodefault

This positions the cursor at the beginning of the time entry portion of the time datetime field.

Hope this helps,

Mike