I came across this article with instructions to create IFTTT.com applets to use Google Assistant to track start and stop times.
Time tracking is something that I could be better at and so it seems to me that this could be a useful tool. Because it uses Google Assistant, I can use the same applet with Google Home, my Pixel 2, or my Wear OS watch.
I created the IFTTT applets as specified and they successfully create new rows in a Google Sheets document I called Work Time Record.
However, the formula for calculating the time difference is not working. Oddly, it is the exact same formula is a IFTTT button applet that I have tested with my Pixel 2 that does the correct calculation.