The court (or parties) will decide how much parenting time (gauged by the number of overnights) the children have with each parent. One parent could have 0, and the other has 365, or 270/95, 183/182, etc. For purposes of parenting time, it is all shared or 'joint' unless there is a reason for one parent not to have any overnights; they still might have daytime visits, though.