so i have Pokemon Black version and my bro has Pokemon White and i have 1 DS lite system with the exact time and date of my country (Australia)
and it's not Winter in Australia right now but my Black version shows up as winter and when my bro plays his white version it's still Autumn and it's ment
to be Autumn (in Australia right now) my black version used to show up as Autumn before but then it changed to Winter like 2 or 3 weeks ago and me and
my bro are using the same DS lite console, so why is it Winter in my pokemon Black version??? thank you very much whoever answers my question

NOTE: MY POKEMON BLACK VERSION AND MY BROTHERS WHITE VERSION ARE BOUGHT OFFICIALLY FROM A RETAIL SHOP IN AUSTRALIA.

 

Those games have their own Season cycle. You just gotta live with whatever season you have.
No glitch, bug or anything. nothing to be afraid of.

 

Try telling your brother to enter and exit a building, the season should change.
BTW,
Spring months: January, May, September
Summer months: February, June, October
Autumn months: March, July, November
Winter months: April, August, December
in the game.