I find the following in help of the Syslog Analysis Overview:
Managed devices send syslog messages that contain a time stamp reflecting the device's local time zone. Because the device time zone might differ from the server, the Syslog Analyzer converts time stamps in all Syslog messages to GMT format for all supported time zones. If a device time zone is not supported, the server time zone is used. If a managed device is not configured to send time zone information with its messages, Syslog assumes the device resides in the server time zone and uses that time zone in the message time stamp. For example, if a managed device in India is set to the local time zone, sends a syslog message to an Essentials server in California, and the message is then viewed on a client browser in New York, the message will reflect California time.
It is recommended that you set the country code variable with the appropriate country code in the Sa.properties file located in the directory NMSROOT/lib/classpath/com/cisco/nm/sysloga/sa, to make sure that the Syslog timestamp conversion works correctly. For example, if you are in Singapore, you must set the country code variable as COUNTRY=SGP.
For a list of country codes, see the file, CountryCode.txt, located in the directory, NMSROOT\lib\classpath\com\cisco\nm\sysloga\CountryCode.txt. The country code is the 3-letter abbreviation specified in the CountryCode.txt (in column A 3).
Syslog reports are always displayed by converting stored GMT time to server time.
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