This datapack depends on: DrakonCore
A simple datapack that turns Clocks into functional stopwatches. It will tick up when in your main hand, and can be paused by swapping the item to your offhand (default key F). The clock will be completely reset if you select another item, and is accurate to the nearest tenth of a second.
Tip: Place the Clock directly into your offhand to start at 0.0 seconds, then swap hands when you want to start the timer.