How many years will have passed by September 10 2010?

That will depend on where you start counting from. We cannot be exactly sure when time began, so there is no definite answer as to how many years had passed by September 10 2010. At the time of answering the question, the 29th of December 2013, 3 years and 3 months and 19 days have passed since September the 10th 2010.