Managing the activity start/end doesn't seem to be able to solve the
issue, as there isn't an option to manage the time of day that the
activity can be seen. It only lets me determine the start and and
date/time of the activity. The only place I can see that lets me display
the activity at certain times of the day is in the 'Time Frame' section
when creating the rules, which is what prompted my initial query around
the time zone.