experiment: a form with two text boxes and a button with _Click.
Private Sub Test_Click()
Dim isnow As Double
Dim issex As Double
isnow = Now()
issex = isnow - Int(isnow)
Text1.Value = isnow
Text2.Value = issex
....you'll want at least 8 decimal places displayed in the textboxes.
gotta confess i never found the need to use a database manager as a millisecond stopwatch so this doesn't take you all the way to a solution (...also i don't trust windoze to feed the time accurately).
access dates are doubles in the format DAYS.FRACTIONALDAYS (0.00 being defined as the moment of mr. gates' conception or something similarly important)