Bypassing Time Validation Routine

I have a userform in which the user selects an individual's name from a combobox (ce_name), and then enters the start (ce_start) and end (ce_end) times in two proceeding textboxes. These two time values are checked then to see whether they are valid times. (custom function onExit)

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The problem I'm having is bypassing the time validation check when the user selects "Not staffed" from the combobox. If the user selects "Not staffed", I have the time start and time stop defaulting to an "X". Well ... you can see the problem. Although I want an "X" in this scenario, the validation check disallows it.

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What might you suggest I need to add to provide a bypass when ce_name = "Not staffed", or ce_start / ce_end equal "X"?

Thank you in advance.

Jenn

Really? I obviously never thought things could be that easy.
Thanks Joseph!