With your date in cell A1,
First, format cell B1 as a DATE field
Right click your mouse, select Format Cell, Select Number Tab,
select Date, choose the date format you want.
Next, in cell B1 enter the formula:
=DATEVALUE(MID(A1,5,3)&" "&MID(A1,9,2)&", "&RIGHT(A1,4))
That should give you what your looking for.