It's oddly interesting to see how Sunday trading and alcohol sales are handled in various parts of the world.. in Germany, it seems few places are allowed to open - or rather, to actually sell anything, leaving some places to open for viewing only. In the UK, large stores can only open for six hours, often 10am-4pm, whilst corner stores have complete freedom. I don't recall noticing any special restrictions in Malaysia or Singapore, other than some places noting they won't sell alcohol to Muslims.