How to find a rotation of a child object

So I have an object called 'hinge' with a rotation of (0, 0, 0) and a child object of hinge called 'door' with a rotation of (0, 45, 0). There is a script attached to this door and the hinge becomes a parent of door on runtime. Now if I have this piece of code

 print (transform.rotation.y);

it gives me a value, but when I put this code

 EndRot2 = Quaternion.Euler (0, transform.rotation.y, 0);
         print (EndRot2.y);

it gives me another value, how is this possible and how can I make it so that Endrot2 stores a rotation that is (0, 45, 0)

Thank you!