When you create an inwards consignment, there are multiple dates involved. There is the date the consignment was entered, the expected arrival date, and dates for when product was received into the warehouse and when the consignment was closed.
Storage is charged from the date when that product was received into the warehouse.
When receiving product into the warehouse, it will automatically set the receive time as 'now', however this can be changed to an 'other time' to reflect when the product was actually received.