The Time Periods setup page shows the current list of valid times for this control. Use the Delete, New, and Edit buttons to change this list, or double-click on an entry to change it.
Click on New in the Time Periods setup page to bring up this dialog:
Use this dialog to create new and modify existing time specifications. Each entry specifies a time range in a set of days, using 24-hour time.
Time periods cannot span over midnight. For example:
03:00 to 23.59 is OK
00:00 to 02:59 is OK
23:00 to 00:10 is incorrect: split this period into two times: 23:00 to 23:59 and 00:00 to 00:10