Nayan
I want to suggest a setting which allows to toggle between whether to use Winter Time or not.
So the user who wants to use it they can just toggle it on so their timings are automatically adjusted and the league timings do not change.
This will ensure that the league timings are not altered and only people who are affected by the Winter Time adjustment can toggle it on and race at the same time as before.
Nayan.
In your situation this would not help. You are in a league with a British host (or so his flag suggests), if you remain in this league you are most likely going to have to put up with an inconvenient race time for six months of the year.
Your best solution is to find a league with an Asian host because the races are most likely to be at a time more convenient to you. Alternatively, if such a league doesn't yet exist you could set one up.
This suggestion, your previous thread and your posts on your league wall indicate that you want a single occurrence of a race to run at different times which is impossible without a DeLorean and flux converter.