The time zone differences can make it tricky to correlate Umetrix Data logs with the corresponding PCAP logs collected on the media server (especially as computers will often present times in your local time zone instead of the time zone the information was collected in). The following rules should help you make sense of the data.
Look at the timestamp in the name of the Media Server PCAP log file as the easiest way to be sure of the local time of the log.
Time Zone Information