Resolution:
BE is a pure JAVA program. The Daylight Saving changes should be taken care of the JVM that you use, if this is not a regular DST change, then please check with your JVM vendor for any fix that is currently available.

If you use history for DateTime type concept property, the history value is stored as UTC milliseconds from the epoch.  You need to look at the logic if you are doing calculation (or setting the history value) without giving the timezone info.  e.g. parsing/using datetime without giving the TimeZone info, etc.