The EXSLT date-time() function always returns "Z" as
Reported by Pete Beazley [email@example.com]
Applies to 6.5, 7.0, and all versions since the date-
time() function was introduced.
Source code fixed (both code branches). The fix will
give the date/time and timezone according to the
default locale for the machine.
Tested by test case exslt50, but needs manual checking.