If Christmas and Boxing Day or January 1st or 2nd fall on a weekend the following Monday (and Tuesday it both holidays are at the weekend) becomes the holiday.
This doesn’t happen with Anzac and Waitangi Days which are observed on the appropriate date regardless of which day it is. Once every few years when they February 6 and April 25 fall on Saturday or Sunday people lose out on a shorter week.
That is why there is a move to Mondayise these days.
I am not too bothered about Waitangi Day. It will impose an extra cost on employers who would have to pay staff time and a half and a day off in lieu, but no more than when the day falls on week days as it does more often than not.
But Anzac day is different. Its express purpose is to honour the people who served our country in wars and especially those who died or were wounded in doing so.
It’s not just a holiday like Queens Birthday or Labour Day and should not be treated as such.