Time Period Schedules 
A logical grouping of time periods.
You use a time period schedule to return data from a particular shift.
To access the Time Period Schedules screen, on the SAP MII administration menu, choose 
Data Services 
Time Period Schedules. 
Structure
Each schedule must have a unique name. You must add one or more time periods to the time period schedule in chronological order. The system determines which schedule to use based on the current time and the time period.
Example
Plant A runs three shifts a day:
First shift, from today at 8:00 AM to today at 4:00 PM
Second shift, from today at 4:00 PM to today at 12:00 PM
Third shift, from today at 12:00 AM to 8:00 AM
To return data for a shift, you define the Schedule and TimePeriod parameters in the query. In the TimePeriod parameter, you enter CurrentShiftto return the current shift's start and end times or you enter P reviousShiftto return the start and end times from the shift that ended before the current shift.
At 9:00 AM, you use the query Schedule=SampleShiftS chedule&TimePeriod=CurrentShiftto retrieve the first shift time period because that is the schedule that is currently operating. If you query Schedule=SampleShiftSc hedule&TimePeriod=PreviousShiftat 9:00 AM, the system returns the time period for the third shift.