From the DateTime docs
Ambiguous Local Times

Because of Daylight Saving Time, it is possible to specify a local time that is ambiguous. For example, in the US in 2003, the transition from to saving to standard time occurred on October 26, at 02:00:00 local time. The local clock changed from 01:59:59 (saving time) to 01:00:00 (standard time). This means that the hour from 01:00:00 through 01:59:59 actually occurs twice, though the UTC time continues to move forward. If you specify an ambiguous time, then the latest UTC time is always used, in effect always choosing standard time.
poj

In reply to Re^4: Converting local time to utc time by poj
in thread Converting local time to utc time by ureco

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