I'm looking for a way to use two toggle buttons to help users calculate the time it takes them to complete a task using a spreadsheet.

I've created two toggle buttons and placed them over Cells C7 (ToggleButton1) and D7 (ToggleButton2)
I've changed the captions on the buttons to ""
I've linked each toggle button to the cell that it's contained in
I've changed the toggle button size so that it fits into a 12x12 sized cell

Column A is the duration
Column B is the first toggle button
Column C is the date the first toggle button was depressed
Column D is the second toggle button
Column F is the date the second toggle button was depressed

Columns C,E are formatted to display the date as "m/d/yyyy h:mm"
I have this formula in Column A [=IF(C9="","",IF(E9="","",E9-C9))]

I understand that you can apply VBA to the worksheet tab so that when a specific column changes the date is entered into the targeted column

I'm using...
Private Sub Worksheet_Change(ByVal Target As Range)
Col = Left(Target.Address, 2)
If Col = "$D" Then Target.Offset(0, 1) = Now
If Col = "$B" Then Target.Offset(0, 1) = Now
End Sub

My problems are
1) Changeing the toggle buttons do not activate a Worksheet Change that then puts the current date and time into the desired column/cell
(I don't want the dates to change when I close, reopen, recalculate, etc. I only want the date/time recoreded for when the toggle buttone was/is depressed)
2) I don't want to see a date if the toggle button is in the normal (un-depressed) state.
3) I want to create more toggle buttons in other locations of the spreadsheet (using the same columns for data entry/calculations)
4) I want the calculated duration (Column A) to show the number of day(s) Hour(s) Minute(s)

I hope I've been specific enough with this question.

Thanks for your help in advance