This Act may be cited as the Summer Time Act, 1929.

In this Act the expression “New Zealand standard time” means New Zealand mean time, as fixed by a resolution of the House of Representatives of which public notice was given in the Gazette of the thirty-first day of October, eighteen hundred and sixty-eight, such mean time corresponding to the longitude of one hundred and seventy-two degrees thirty minutes east of Greenwich, and being eleven and a half hours in advance of Greenwich mean time.

For the purposes of this Act the period of summer time shall be taken to be the period beginning at two o’clock, New Zealand standard time, in the morning of the second Sunday in October in any year, and ending at two o’clock, New Zealand standard time, in the morning of the third Sunday in March in the next succeeding year.

The time for general purposes in New Zealand shall during the period of summer time be thirty minutes in advance of New Zealand standard time.

Whenever any reference to a point of time occurs in any enactment, Order in Council, order, regulation, rule, by-law, deed, notice, or other document whatsoever, the time referred to shall, during the period of summer time, be deemed, subject as hereinafter provided, to be the time as fixed for general purposes by this Act.

Reference to any specified point of time in any award or industrial agreement relating to workers employed in the threshing of grain or the shearing of sheep shall be deemed to be reference to New Zealand standard time:

Provided that any employer and the workers employed by him may at any time elect, by mutual agreement, that such reference shall, for any period or for any particular purpose during summer time, be deemed to be reference to summer time. Any such election may be at any time in like manner revoked.

Nothing in this Act shall affect the use of New Zealand standard time for purposes of astronomy, meteorology, or navigation, or affect the construction of any document mentioning or referring to a point of time in connection with any of those purposes.