You are missing the point. My point is that that particular datetime is parsed as
2013-02-03 19:54:00 +0000 PST
on some machines, and
2013-02-03 19:54:00 -0800 PST
on others. This is means that the timezone offset IS different and the absolute time IS different. One is 8 hours ahead of another even though the original string is the same.