How was the timestamp of the data again created. I know i read it somwhere but don't remember. Was it UTC timestamp is there a problem with daylight savings time of Japan? As far as i understand UTC is a constant "world time" and all timezones of the earth a derived from UTC.

Is something known, that there is some problem with the timestamps like Mark K. changed (for whatsoever reasons) , the timesettings of servers or something like this?