Duplicating from a cold backup using RMAN
The methods are the same. When you create a duplicate database from a RMAN backup (hot or cold), RMAN choose the most appropriate backup for your task. You cannot tell RMAN to use a hot or a cold backup. RMAN decides this for you. IF you specify an UNTIL TIME criteria, then RMAN will roll forward from that backup (hot or cold) until the time specified.