Occupancy First Day of the Week: Schedule of occupancy for the building. This defines what day of the week the building is expected to be predominantly occupied.

Occupancy Last Day of the Week: Schedule of occupancy for the building. This defines what day the building is expected to be predominantly unoccupied.
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As an example, if an office building is being modeled, that is operational from Monday to Friday, the Occupancy First Day of the Week would be Monday and the Occupancy Last Day of the Week would be Friday.