Description of problem:
"mrtg.cfg" contains "Timezone[target]: Earth/Place".
When generating output HTML document, MRTG ignores timezone in 
date/time.
When calling rateup, timezone correctly used inside graph.

Library /usr/lib/mrtg2/MRTG_lib.pm contains "datestr" sub.
This sub is called out of "writehtml".
"perl -d" shows, that before entering "localtime()" $ENV{TZ}
contains different timezone, than system's one.
But localtime() returns time, converted with system's /etc/localtime.
"strace" shows, that file "/etc/localtime" is opened.

Code cut to test perl program shows, that in normal case TZ= is used.
"strace" shows, that file "/usr/share/zoneinfo/Earth/Place" is opened.


Version-Release number of selected component (if applicable):
mrtg-2.10.15-1


How reproducible:
Every time


Steps to Reproduce:
1. Use cfgmaker to produce simple interface config
2. Add Timezone[target]: Asia/Novosibirsk
3. Add "pngdate" to list of target options
4. Invoke MRTG "/usr/bin/mrtg <cfg>"
5. Take a lookup on output HTML in browser.

  
Actual results:
"The statistics were last updated" part has system's localtime.
PNG picture has different time.


Expected results:
"The statistics were last updated" part must have the same
time representation as on PNG picture.


Additional info:
Problem may be
1) in mrtg, garbaging memory
2) in perl-lib, not putting TZ=Earth/Place in libc's envp[]