SEPM uses UTC timezone instead of system time zone setting, after upgrade from 12.1 to 12.1 RU2.

And I can see many warning messages in the log file "reporting.log" located in "D:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\apache\logs" 

2013-06-18 01:16:09 Refreshing reporting log[18-Jun-2013 01:16:09 UTC] PHP Warning:  mktime() [<a href='function.mktime'>function.mktime</a>]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for '8.0/no DST' instead in D:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\Php\Include\Util\util.php on line 4090
[18-Jun-2013 01:16:09 UTC] PHP Warning:  mktime() [<a href='function.mktime'>function.mktime</a>]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for '8.0/no DST' instead in D:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\Php\Include\Util\util.php on line 4090

How can I reslove this problem?

Thanks in advance.

Symantec Endpoint Protection Manager Notification Emails Display all Event Times in GMT

The articles discussed are not for my issue.  Since SEPM runs well, I decide to ignore this warning.

Anyway, thanks for your help.