formatting date according to timezones?

A question regarding date formatting with exslt:

Is it possible to get the time zone taken into account, so that a new
date is calculated according to that for the output?

Some example to try to explain what I want to achieve:

for input data:
2008-01-04T20:34:07.86+02:00
i want the output to be
2008-01-04 22:34:07

for input data:
2008-01-04T20:34:07.86+05:00
should become
2008-01-05 01:34:07

and so on.

Any tips on how to achieve this?

cheers,

RJ