Report on task due dates being changed, how many and duration

Hi folks, i want to put a report together on tasks that have their due dates changed. 

I want to show, what tasks are being changed, how many times they are changed, and the duration of the tasks. 

Ideally i would like to be able to compare directly against the template that the project was set up with. 
To pinpoint where in projects we are constantly pushing a tasks due date. 

thanks all!