creating a getRealTime countdown timer

[marcelluss]

Hello, I would like to know if it is possible to make a countdown timer without using the SetTimer function? I wanted to do this in a more optimized and correct way because the usual SetTimer does not work quite in time. And I would like to make a dynamic function in which I can enter, say, 60 minutes into the arguments and a countdown timer will start with the output of minutes and seconds and at the same time use getRealTime. I tried to use many ways with this function, but they were all unsuccessful + I have already tried to find solutions on the forum and on the Internet, but all used SetTimer - unfortunately, it will not work to provide a ready-made code for my solution, because not one of them was even close to the solution I was moving towards