1947, actually. Prior to this there were no Canadian citizens, we were all British Subjects
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In New Zealand it was about a year later...
I was born British in Dec 1948
One month later in Jan 1949 my mother had my birth registered and lo and behold
I was given a New Zealand birth certificate..
Years later though when I applied for a New Zealand passport I was told I could also get a British passport because of my birth date...prior to Jan 1948...
I didnt understand the significance at the time and thought it very odd and opted for the NZ passport...
Did I have dual citizenship ??
I dont know..
You were a subject of the Queen, and the state at the time (New Zealand), had no desire to strip that status from their citizens.
The Commonwealth tends to treat Britain differently from the rest of the world (for obvious reasons).