 The first Islamic call to prayer or Azan (also spelt Adhan), known as "subuh" (or dawn), occurs between as early as 4.30 AM to as late as 6.15 AM (depending on which region, city and state) with the exact time drifting throughout the year.Most Malaysian businesses start work as early as 7 AM up till as late as 9 AM.Many mosques amplify the early prayer call by way of loud speakers, and while in some cases only a few neighbouring homes are affected, some large mosques (for example the State Mosque of Selangor which has speakers on its minarets) have prayer calls which can be heard in a large surrounding area.