The watchface displays time in adaptive precision, depending on the user activity detected on the watch. 
The precision is calculated using weights on an activity log over the last minute, hour, day, and month. The weights are increased on tap/shake events, as well as button interactions. The weights are decreased with time. 

Current steps are:
HH:MM:SS, HH:MM, HH::MM (in 5 Minutes), HH MM (in 15 Minutes), HH, Day of Week, Month, Year