It would be useful for the DataField I'm working on (which records steps for an activity) to be able to simulate a walk that crosses over midnight and has the step count reset to zero. There seems to be no way to simulate this behaviour at present - I tried setting my system clock to 23:59 and also "Fast Forwarding" the activity monitor by 1500 minutes - in both cases the step count just kept going up. You definitely shouldn't have to mess with the system clock to get this feature to work either - it should happen on the back of Fast Forwarding, or else there should be a menu option to simulate the end of the day occurring. Perhaps there actually is - I see there's a "Time Simulation" menu option but it seems permanently disabled and I've never worked out why. Is it only for watch faces?