When "svn log" is used with the -xml option then it produces a raw time stamp that (UTC?) is independent of the current time zone. StatSVN should nevertheless print the correct time in the output.
For example svn log shows for me:
mucuna ~ $ svn log ~/cs520/2008/groups | head
------------------------------------------------------------------------
r2723 | xdong4 | 2008-09-28 23:37:13 -0400 (Sun, 28 Sep 2008) | 1 li
Note the -0400. On the other hand, svn log --xml shows:
mucuna ~ $ svn log --xml ~/cs520/2008/groups | head
<?xml version="1.0"?>
<log>
<logentry
revision="2723">
<author>xdong4</author>
<date>2008-09-29T03:37:13.264143Z</date>
This is the same entry but the latter is off by 4 hours (compared to local time). Therefore StatSVN currently shows 3:37 instead of 23:37.