Capital: Wellington, Longitude 174°E 46´ Latitude 41°S 17´

Local mean time was observed up to 1868. Standard Time Meridian, 172E30, was adopted on 2 November 1868 (New Zealand Mean Time, 11 hours 30 mins in advance of Greenwich Mean Time).

Summer time 1927 was observed for one year only when clocks were advanced one hour (New Zealand Summer Time, 12 hours 30 mins ahead of GMT. At commencement clocks were advanced 1 hour at 2:00 am (Mean Time) to 3:00 am (Summer Time). At the conclusion, clocks were turned back at 3:00 am (Summer Time) to 2:00 am (Mean Time).

Summer time was observed during 1928-1945 when clocks were advanced only 30 mins, 12 hours ahead of GMT. At commencement clocks were advanced 2:00 am (Mean Time) to 2:30 am (Summer Time). At the conclusion, clocks were turned back at 2:30 am (Summer Time) to 2:00 am (Mean Time).

Summer time periods
Started Period Finished Advanced
1927 6 November to 4 March 1928 one hour
1928 14 October to 17 March 1929 30 mins
1929 13 October to 16 March 1930 30 mins
1930 12 October to 15 March 1931 30 mins
1931 11 October to 20 March 1932 30 mins
1932 9 October to 19 March 1933 30 mins
1933 8 October to 29 April 1934 30 mins
1934 30 September to 28 April 1935 30 mins
1935 29 September to 26 April 1936 30 mins
1936 27 September to 25 April 1937 30 mins
1937 26 September to 24 April 1938 30 mins
1938 25 September to 30 April 1939 30 mins
1939 24 September to 28 April 1940 30 mins
1940 29 September continuing to 31 December 1945 30 mins

From 1 January 1946, what was formerly known as New Zealand Summer Time, 12 hours in advance of GMT, became New Zealand Standard Time, 12 hours in advance of GMT. The abbreviation for both these meridians is NZST and both correspond to the longitude of 180E00, 12 hours in advance of GMT.

Daylight time was introduced in 1974, for the periods listed below. At commencement, clocks were advanced 1 hour at 2:00 am (New Zealand Standard Time: NZST) to 3:00 am (New Zealand Daylight Time: NZDT), corresponding to a longitude of 195E00, 13 hours ahead of GMT. At the conclusion, clocks were turned back at 3:00 am (NZ Daylight Time) to 2:00 am (NZ Standard Time).

NZ Daylight time (NZDT) periods
Started Period Finished Advanced
1974 3 November to 23 Feb 1975 one hour
1975 26 October to 7 March 1976 one hour
1976 31 October to 6 March 1977 one hour
1977 30 October to 5 March 1978 one hour
1978 29 October to 4 March 1979 one hour
1979 28 October to 2 March 1980 one hour
1980 26 October to 1 March 1981 one hour
1981 25 October to 7 March 1982 one hour
1982 31 October to 6 March 1983 one hour
1983 30 October to 4 March 1984 one hour
1984 28 October to 3 March 1985 one hour
1985 27 October to 2 March 1986 one hour
1986 26 October to 1 March 1987 one hour
1987 25 October to 6 March 1988 one hour
1988 30 October to 5 March 1989 one hour
1989 8 October to 18 March 1990 one hour
1990 7 October to 17 March 1991 one hour
1991 6 October to 15 March 1992 one hour
1992 4 October to 21 March 1993 one hour
1993 3 October to 20 March 1994 one hour
1994 2 October to 19 March 1995 one hour
1995 1 October to 17 March 1996 one hour
1996 6 October to 16 March 1997 one hour
1997 5 October to 15 March 1998 one hour
1998 4 October to 21 March 1999 one hour
1999 3 October to 19 March 2000 one hour
2000 1 October to 18 March 2001 one hour
2001 7 October to 17 March 2002 one hour
2002 6 October to 16 March 2003 one hour
2003 5 October to 21 March 2004 one hour
2004 3 October to 20 March 2005 one hour
2005 2 October to 19 March 2006 one hour
2006 1 October to 18 March 2007 one hour
2007 30 September to 6 April 2008 one hour
2008 28 September to 5 April 2009 one hour
2009 27 September to 4 April 2010 one hour
2010 26 September to 3 April 2011 one hour
2011 25 September to 1 April 2012 one hour
2012 30 September to 7 April 2013 one hour
2013 29 September to 6 April 2014 one hour
2014 28 September to 5 April 2015 one hour
2015 27 September to 3 April 2016 one hour
2016 25 September to 2 April 2017 one hour

Note:
NZ standard time (NZST) is 12 hours ahead of GMT.
NZ daylight time (NZDT) is 13 hours ahead of GMT.

Note: On 30th April 2007, the Minister of Internal Affairs announced that New Zealand will be observing daylight time from the last Sunday in September through to the first Sunday in April the following year.

Time Change information was researched by Carol Squires.

References: NZ Dept of Internal Affairs, NZ High Court Auckland Library, Auckland Public Library, New Zealand Herald, and Astrological Society of NZ Inc Journal of the Seasons, Vol 2, 1975.

© Carol Squires, 2016
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