there is no such thing as negative time. however, you could probably use a custom number format (time format), or possibly even use the time TIME(), DATE() or FORMAT() functions to get it to look like what you want when you capture it. for instance (and I did not test this):
="-" & format("10:00", "short time")
if you've already figure out how to set the timer, more than likely, in order to reverse it ad start counting negatively, you will simply have to let the timer run on the positive side and concat a negative sign when you want to stop it. like:
string variable = "-" & timer_value
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