Season Not Matching Date

Hi Allhoping someone can shed some light on this problem.When i use FS2004 i run it with timesync. I have set it up for the southern/Eastern hemisphere as I live in Sydney Australia.The problem is this:The date and time is correct however it says the wrong season eg:todays date 18th of December gives me the season FALL when in Australia it is infact SUMMER!Also when I do a long flight say from Australia to Japan, I should be leaving Australia in Summer and Arriving in Winter. But this is not the case.Basically the Seasons doesnt match the Date in my flightsim..... does anyone now a patch or mod to fix this?Thanks