it is possible this is related to the changing of the daylight savings clock change dates. I know there is a more technical
word for that,
A couple years ago, the date when the clocks were supposed to be turned ahead in the spring was moved up, so any existing timezone rule data would still perform adjustments using the old days, making the time it returned be one hour ahead, or behind between the intervals of the old daylight savings day and the new one.
The solution is to update the timezone data files, but the official fix to the timzeone rules files for daylight savings adjustments in Java was not available to java until after Java 1.5.0 update 11 or so. do, or if it is even possible and would work.