The same issue is seen with the Alarm tables showing in the OneClick console, but this can be adjusted.
The OneClick (or any Java) application uses the JVM locale and the JVM locale is decided by the System locale.
In windows, the JVM (from Java 1.7 onwards, http://bugs.java.com/bugdatabase/view_bug.do?bug_id=7073906) picks the system locale only if the 'DISPLAY' language is set. Otherwise it falls back to default en_US.
After setting the "DISPLAY" language, the alarm table is showing the format DD/MM/YYYY.
But it is still not showing correct in the Event table.