The “timePeriod” attribute on the ‘DayPropertyType’ has a data type of “TimePropertyType”. The below table describes how this data type is constructed.
Constraints: A TimePropertyType shall have at least one of timeRange, or namedTime. When namedTime = 'All Day' no other values for namedTime or timeRange shall be populated.
TimePropertyType attributes
namedTime
These are named time periods that do not relate to the same time each day.