I can almost understand the requirement to post the time an event occurred in UTC (not my personal choice however) but the below capture from one of my client machines that does operate in a different timezone is a tad confusing (see below)

Agent Time: 2011-04-19 08:33:28Z
Event Time: 11:03:08 PM 18-Apr-2011 UTC

As I understand it, Zulu is UTC.