Hi,
How can a object be rotated like a door hinge, all rotation takes place in the center of an object.
You can move the 3d cursor to the point where you want to pivot (just left click where you want it to be) and change the pivot point (selected in red above) to 3d cursor. Then you can rotate however you like while the object spins around the 3d cursor. Hope that helps.
Move the object origin to the location of the hinge (set the origin using the options in the toolshelf or the Object / Transform menu)
or
Position an empty at the hinge location, parent the door to the empty and rotate the empty
or
Position a bone at the hingle location, parent the door to the bone and rotate the bone