Even Windows gets this right.
Really pathetic. It's something fairly high on the minds of Americans since they recently decreed summer would be extended.
All North Americans get really good at time zones as it affects TV schedules ... show is on at 7pm Eastern and 6pm Central. In the West i's different ... showing at 7pm, 8pm Mountain.
USA, Canada, northern Mexico’s border cities
DST Begins 2 a.m. (Second Sunday in March)
DST Ends 2 a.m. (First Sunday in November)
DST Begins 1 a.m. UTC=GMT (Last Sunday in March)
DST Ends 1 a.m. UTC=GMT (Last Sunday in October)
In winter Canada has 6 time zones, in summer 7 - Saskatchewan doesn't do Daylight Savings.
Funny thing is, for all it's other faults Windows always got time right. Just shows how parochial Jobs really is.