Hello, I need help in processing 3. I have already figured how to make the stopwatch count foward but im struggling to make it start counting in reverse. Your help will be appreciated. Thanks!

Q1. Create a processing program of a stopwatch working forward and reverse. In order to build a stopwatch , we have to first build 1/60 (8) time counter. By default, when the code is run, the stopwatch should count forward every 1/60 of second. When a mouse key is pressed, the stopwatch will start counting reverse. The stopwatch style is: HH:MM:SS:CC; where HH,MM,SS and CC show 2 digits hours, minutes, seconds and 1/60 seconds respectively. When the stopwatch is counting reversely and reaches zero, it should not be negative. It means that when the stopwatch is reduced to get negative values, its value should be stopped on zero. Timerr 0:0:7:1