Restart stopwatch from previous time

Hi, I am using a stopwatch script that allows me to start, stop and reset in the active cell. The only problem I have is that when I go back to a previous cell with the time already inserted, it resets back to 00:00. I would like to continue the time from the previously inserted time. For example if I want to start from 00:00 I would first have to enter it into the cell and then press reset or if 10:00 is inserted it will reset to 10:00 and when start is pressed it will continue to count up from 10:00. Another way to say it is that I would like the stopwatch to start from whatever time is already inserted in the cell. Any help would be much appreciated.

Here is the code that I am using:

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Hi Leith, just a little follow up question: Can it restart using the text from the formula bar instead of from the cell?

Many thanks