Period control method in depreication calculation

Dear all,

For a given tax depreication key we have maintained the period control IN1. Depreciation to the day setting is deactivated in depreciation key. Our requirement is system should calculate depreication based on the acquisition date. if the acquisition is in first six months then full depreciation, if the acquisition is in the next six months then no depreciation. Kindly suggest how this can be achieved by using which period control method

Regards

Priyadarshini