does it not change automatically?
my bog standard, entry level astra did, although it did it a few days late, so surly the 159 / brera should change???
ill just leave it an hour fast for a few days and see if anything happens. only got the car in april after the clocks changed to summer time...........
Press the button marked MENU on one of the left stalks when stationary. Scroll through the options on the screen behind the wheel and one will be clock, or time or something similar. I just did it last night.