Formula to return the date of the fourth Thursday in a given month/year

Using Excel 2013, I need a formula that returns the date of the fourth Thursday in a given month.  For example, if the date in

A1 = 11/2/2012
B1 needs a formula that references A1 and returns 11/22/2012

or if

A1 = 11/1/2014
B1 needs a formula that references A1 and returns 11/27/2014.