#166 CIMDateTime does not take account of DayLight Savings time

[Anonymous]

When in daylight savings time, passing a Date or Calendar
Object to the constructor of CIMDateTime does not give a
correct time offset to GMT.

For exaple, when in PST Daylight time (9 hours behind
GMT) you the conversion thinks you are 8 hours behind.

The problem lies in the getCalendarString method. It is
because this method get the TZ offset, but not the Daylight
time offset, hence the hours difference.