fixed issue with timezone support, if the timezone defined on the local system is basically invalid, catch the die() from DateTime::TimeZone and just override it to Chicago.
fixed issue with timezone support, if the timezone defined on the local
system is basically invalid, catch the die() from DateTime::TimeZone
and just override it to Chicago.

fixes: http://code.google.com/p/perfsonar-ps/issues/detail?id=819

dwcarder/psTracerouteViewer,dwcarder/psTracerouteViewer,dwcarder/psTracerouteViewer,dwcarder/psTracerouteViewer