Convert dates from ISO time format to yyyy/mm/dd.hh:mm:ss

Convert dates from ISO time format to yyyy/mm/dd.hh:mm:ss

How do I convert this:
2013-08-16T13:24:18+0200
from the current format which is yyyy-mm-ddThh:mm:ss+hhmm to this format?
yyyy/mm/dd.hh:mm:ss (2013/08/18.13:24:18)
The values are in a csv file and there are also negative values so I can't
just substitute hyphens with forward slashes, also I want the part that
specifies the time zone removed. My knowledge of sed and awk is very
basic.