As a general rule offices are open from 9 am to 5 pm (8 am to 4 pm during the summer months) on weekdays. Shops are generally open from 9 am to 6 pm on weekdays. Several supermarkets and shops in malls have extended opening hours and are also open on weekends.
The Icelandic monetary unit is the "krona". All Icelandic banks (open 9:15 am to 4 pm) provide money exchange as well as the Change Group Iceland at the Tourist Information Center in Reykjavík (open from 8:30 am to 8 pm 7 days a week). Exchange banks are also operated in the arrival and duty free areas of the airport.
Debit and credit cards are accepted by most organizations and are widely used. The major cards in Iceland are VISA and Eurocard/MasterCard, although other cards are accepted in some places.