I expect it has something to do with the fact that it is trying to convert "China Standard Time" to "Central Standard Time" which is still on "Central Daylight Time" on 9-23-02. Could be why the use of CST et al. is deprecated.
"JavaRanch, where the deer and the Certified play" - David O'Meara
Note to self: don't get into a fist fight with a cactus. Command this tiny ad to do it: