When you do, click on auto detect.
We changed into Daylight Savings here in AU, well at least AEST changed to AEDT on sunday. I had to update my offset from +15 to +16 via auto detect.
Normally my offset from GMT / UST is +10, or +11 (Daylight savings)
So when you go to this page, if your offset according to GMT/UST is currently +10, expect +15. if its +5, expect +10. If its -5, expect 0, if its -10, expect -5