The earliest possible start field allows for the setting of a possible start time before the nominal start time. In most situations this field will be set to 0. When setting to a value other than zero the impact of the potential start time on the days being monitored needs to be considered. See the note under the Monitor Days section above. The nominal start time less the earliest possible start time provides an 'absolute minimum start time' which is used by most of the notification conditions, as well as the monitor days.