Most stores in Iceland are open 10:00–20:00 on weekdays and 10:00–16:00 on Saturdays. The shopping malls are open 10:00–19:00 every weekday, except Thursday, when they stay open later, until 21:00. On Saturdays, they are open 10:00–18:00 and 13:00–18:00 on Sundays.
Normally, supermarkets are open from 10:00 or 11:00–18:30, depending on the store. A few open 10:00–23:00 seven days a week, and some are even open 24/7.
Filling stations are usually open from 09:00–23:30 every day of the week, with a few exceptions which are open 24/7.
Banking hours are Mon–Fri 09:15–16:00.
Post offices in Iceland are open weekdays from 09:00–18:00 in and around Reykjavík and from 09:00–16:30 in the countryside.
Office hours are generally 09:00–17:00, although some operate from 08:00–16:00.