Want current time to be entered w/double click

I am trying to create a time and attendance form. The form itself has the
employees demographic information and the subform is where their entry
records will be. I do not want the employees to have to physically enter the
actual time I want the time to be entered in the field when they select it.

ie: when the employee has to enter their beginning lunch time they just
double click in the field and the current time will be generated.

I was able to set the default value of the date to Now() to keep the date
current but I need to do the same for the time wih out all fields generating
the exact some time. HELP!!!!