Islam entered what is now Vietnam through the Cham, whose Champa kingdom controlled the central coast for centuries before its final collapse to Vietnamese forces in the 1600s. Over subsequent generations many Cham communities in the south — around Chau Doc and An Giang province near the Cambodian border, and later in Ho Chi Minh City — adopted Sunni Islam, while smaller Cham Bani communities in south-central Vietnam blend Islamic and older Cham traditions. Hanoi's own Muslim presence is more recent and much smaller: the city's Al-Noor Mosque was built around 1890 by South Asian Muslim traders who came through French colonial-era commerce, not by Cham migration.
Today Hanoi's worshippers are mostly diplomats, foreign students and a handful of long-settled trading families rather than a large indigenous Cham population, which sits over 1,000 km to the south — so a prayer schedule calculated specifically for Hanoi's coordinates, rather than one borrowed from Ho Chi Minh City or a regional average, is necessary for accuracy.
Vietnam has no national Islamic authority setting local angles, so times here follow the Muslim World League convention, the same reference commonly used by mosque communities across mainland Southeast Asia including Al-Noor Mosque in Hanoi.
Ho Chi Minh City sits closer to the Mekong Delta's historic Cham settlements and absorbed significant Cham migration during and after the 20th century, while Hanoi's community has always been a small, mostly foreign trading and diplomatic presence.
Yes — Vietnam stretches over 15 degrees of latitude, so Hanoi in the north and Ca Mau at the southern tip can differ by roughly 20-30 minutes in Maghrib and Fajr timing on the same calendar day.
Not entirely — Cham Bani communities in south-central Vietnam follow a localized Islamic tradition with modified prayer obligations, distinct from the Sunni schedule this page calculates for Hanoi's mainstream Muslim residents.