When did NZ declare war on Germany?

Answer 1

4 September 1939 because New Zealand was one of the first countries to be involved in the global conflict precipitated by Germany's invasion of Poland on 1 Sept. It was a consequence of Britain's defence pact with Poland, and consequent war declaration on the 3 Sept, and many British commonwealth countries were of course directly affected.

Answer 2

New Zealand declared war on Germany on 4 September 1939, a few hours after Britain. (As New Zealand is 12 timezones ahead of Britain, the declaration of war was made the day after Britain's).

Answer 3

Britain warned Germany that they would declare war on Germany if Germany attacked Poland. When Germany invaded Poland the British had no choice but to declare war.