Rotate whole animation by 90 degrees I make my animation and now I realized that its pointed in wrong direction I used -y (native blender) as direction but I need to be pointed at x axis so what would be the easiest way to rotate whole animation, to switch -y with x :)
On the first frame add an empty at the same location as your object.  ShiftS > Cursor to Selected, then add the empty with ShiftA > Empty.   
Parent the object or objects to the new empty (CtrlP).  
Rotate the empty by 90° along the Z axis.