User Profile - Timezone doesn't take daylight saving time/summertime into account

Some countries observe DST(Daylight Saving) in various time of the year (depending on which hemisphere). During this period, regions's timezone is at GMT+X instead of the standard GMT+(X-1) (i.e. GMT+11 instead of GMT+10). However, Jira user profile does not account for daylight saving time, and it's showing GMT+10 instead of GMT+11 (for Sydney):

Despite wrong GMT zone time is calculated properly.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Go to User Profile -> Preferences -> Update User Preferences
2. Select Region with DST present at this moment

Expected Results

During the DST period(i.e. for Sydney it's from the first Sunday in October to the first Sunday in April), should be at GMT+(X+1).

Actual Results

Region's timezone is at GMT+X instead of the standard GMT+(X+1) during DST.

Workaround

If you want to stop Jira from trying to accommodate DST, you can use the static GMT offset instead: