Correct spelling for first name, second name, years of birth and death, and year of marriage (1924) from Margaret Joy (Joy) Nixon (nee Oliver) b. 1925.
In another document Joy has year of death as 1987?

Year and country of marriage from search on New Zealand BDM website in October 2018:
1925/304. Bride: Mona Elsie Hardley. Groom: Leslie John Oliver
[Note incorrect spelling of first given name].

Full date of marriage of 2 February 1925 from further searching in October 2018 on BDM Search by incrementally changing the date range for the marriage.

Year and country of birth from search on New Zealand BDM website in October 2018:
1904/10605. Hardley, Moana Elsie Mother: Mary Jane. Father: George Harry
[Note: Spelling of first given name is “Moana”].

Full date of birth of 11 May 1904 from further searching in October 2018 on BDM Search by incrementally changing the date range for the birth.