Many users are unsure of the implication of the field "Interval time zone" in the Trend Log configuration window.
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The setting "Interval time zone" under the Trend log configuration has caused some users to believe that this setting stores trend data in either "UTC" or "Server local time"
The trend log data is always stored in UTC time, regardless of the option selected under this setting.
This setting is intended for preventing problems with Daylight Savings Time (DST) when the logging interval is more frequent than 1 hour.
When the interval is longer than 1 hour and you want to continue to log that interval after a DST change, use Server Local Time. For example, the log interval is every 24th hour at midnight and you want to continue to log at midnight even after a DST change, so you use Server Local Time. During the DST change in the Spring, the log sample will register after 23 hours. After the DST change in the Autumn, the log sample will register after 25 hours.
Interval Time zone