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The daylight savings time flag ("$dst") will be "-1" if this information is not available on your system, "0" for no daylight savings time (i.e., winter time) and "1" when daylight savings time is in effect.
#!/usr/bin/perl ... Summer: 2012,7,3,5,48,0,185,2,0 Winter: 2012,12,3,6,48,0,338,1,0