The following versions are offered:
clock.sb3
This reads the current time once and checks and handlessecs,mins,hours. This however can skew over time as Scratch is not accurate enough.clock - current.sb3
This reads the current time on every tick. This does not need to handle the time itself. Accurate.stopwatch.sb3
A simple stopwatch, however has an issue with the buttons triggering reset and start at the same time. Only included for reference.