Change pivot or local origin of an object

How to change local origin of an object, without changing the object location in Blender ?

From this :

To this :

First, you need to go Edit Mode, move the 3D cursor to where you want to put new origin.

Shift+S -> Cursor to Selected.

Second, you go back to Object Mode Ctrl + Alt + Shift + C -> Origin to 3D Cursor

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