This article is from the New Zealand FAQ, by Phil Stuart-Jones and Lin Nah with numerous contributions by others.
New Zealand is 12 hours ahead of Greenwich mean time making it one of the
first places in the world to see the new day. Summer time (or Daylight
Saving Time we call it here) is an advance of one hour at 2am in the
morning on the first Sunday in October and back to NZST at 3am in the
morning on the third Sunday morning of March.
NZST (GMT+12) or NZDT (GMT+13) October - March
A couple of pages showing current NZ time
http://www.wibble.net/time.shtml
http://www.air.com.hk/~jonc/time.html
 
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