A Time Context specifies a particular range, or one (or more) points in time. There are three major components, at least one of which must be selected (by enabling its checkbox on the left):
When not in Beginner Mode, it's possible to specify a global user variable as the source of the
From Time or
To Time by
clicking on one of the rotating-arrow icons.
The variable contents must specify the hours and minutes in 24-hour format and separated by a period (dot) or colon e.g. 13.45. Leading 0s can be ommited e.g. 9.7 for seven-minutes-past-nine-in-the-morning.
Alternatively, the time can be specified in seconds-since-the-epoch format, in which case only the hour and minute part of the specification are used.
When the variable value changes, the time context is reevaluated which may result in it activating or deactivating. If the variable value does not specify a valid time then the profile will deactivate (if it's already activated).
Note: in some cases it may be wise to disable the profile (via the Profile Status action) before changing the associated variable values. For example, if your time context is from 16.00 to 16.00 (i.e. acting as an event) and it should be changed to 17.00,17.00, if you don't disable it first then as soon as you change the first value the time context will become a 23 hour range (17.00-16.00) and probably activate.