How hard would it be to make an app that when activated, it records the current date and time, and then switches back to the watch face? Maybe with some fairly simple way to scroll through recorded time stamps, or a way to read them on a phone or computer?
My use would be as a time clock for work- record a time stamp at the beginning and end, and I can revert back to it to fill out a time card. I'm sure there would be other applications as well.