This was one of those facts that felt like pulling back the curtain and seeing Oz for who he is. When I learned this, it was like an itch I couldn't scratch. Why is the worlds labor day about us... Why is our labor day not? None of the answers to the second question felt satisfying.
It's currently Labour Day in Melbourne Australia. Second Monday of March, though I don't know why they picked that date. It varies between states, but all Australian states have a holiday for Labour Day/Eight Hours Day/May Day.
Fun fact: Melbourne stonemasons were among the first workers to successfully get an eight hour day. On the 21st of April 1856 they marched on Parliament. The first 8 Hours Procession to celebrate was on the 12th of May. So.. No clues on why the fuck it's Labour Day now in March, but it's been a paid holiday since 1879.
Also it's called May Day in the NT and Eight Hours Day in Tasmania. Hope you enjoyed this random info dump. Also I'm very warm please send ice