Time of start of periodic time range in following format:
weekday hh:mm
weekday: 0-7 (0 means the weekday is not specified,
1-7 are weekdays from Monday to Sunday)
hh: 0-23 (hours)
mm: 0-59 (minutes)
Weekday may be 0 only if periodic time range weekdays were specified in
rlTBIPeriodicWeekDayList.