Streaming API - Events to change Date Properties by 1 hour

I’ve noticed that the Streaming API (Company Profile) will send an event for a Company with something like this:

Property: PreviousCompanyNames[0].EffectiveFrom
Value: “06/14/2015 00:00:00”

and then shortly after will fire another event with:

Property: PreviousCompanyNames[0].EffectiveFrom
Value: “06/15/2015 00:00:00”

Is this expected behaviour or some sort of maintenance process running on DateTimes to handle DST?