Didn't world war ii technically start on september 3, 1933, not september 1? because, britain and france declared war on the 3rd. germany just invaded poland on the first. or am i missing something?

WWll started on July 7th 1937 and ended on September 2nd 1945. That's if one assumed it from started and ended in the viewpoint of the Asia side of the War. But if one assumes the starting and ending point of WWll is in Europe, then it begun on September 1st 1939 and ended on May 8th/9th 1945. But please note, that a WW2 timeline can differ depending on the point of view of the individual/student. Because Germany had already declared war on parts of Europe in 1939 but it was Japan who attacked The U.S. which then lead to the retaliation of America upon Japan only then furthering the U.S. into the war.