one command button to work with two formula

hi,

Im back again for more learning. I have a two codes written specifically to work with 2 command buttons namely START and END. My question is can I combine two formulas or codes to work with only 1 command button?

Here is the code for the START button:

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Here is the code for the END button:

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Is it possible to put together all these vba codes and make it work using only one command button? Like if user clicks on START then it will paste the time on the worksheet and make the END button appear. Then when the END button is clicked the button becomes disabled. These button will not only work once because there are a lot of users.