Son La, Vietnam
Son La uses Vietnam’s national time: Indochina Time, UTC+7. The offset stays constant all year, with no daylight saving clock changes in this mountainous northwestern region.
Thi Tran Thuan Chau, Vietnam
Friday, 4 September 2026
UTC+7 · Asia/Ho_Chi_Minh
Time and sun data for Thi Tran Thuan Chau — the largest city of Son La
The sun in Thi Tran Thuan Chau
Sunrise 05:51 Solar noon 12:06 Sunset 18:21 Daylight 12 h 30 min Night 11 h 30 min Civil twilight 05:28 – 18:44
Vietnam · 1 898 cities · page 1 of 10
Largest cities
- Thi Tran Thuan Chau 153 000
- Son La 106 052
- Chieng Coi 22 624
- It Ong 16 153
All cities — page 1
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Current time in Son La, Vietnam
The local hour in Son La is obtained by adding seven hours to UTC. It matches Hanoi and the rest of Vietnam. Visitors arriving from another Vietnamese province can leave their watches unchanged, while international callers should convert from their own current offset.
Asia/Ho_Chi_Minh is the usual database identifier for Vietnamese local time. It is suitable for calendar software, travel applications, and scheduled calls involving Son La. The mountain road may add hours to a journey, but it adds nothing to the UTC offset.
Son La city and other major centers
Son La city is the provincial capital and the natural default for a city-level time or sunrise lookup. Moc Chau is a prominent center on the plateau to the southeast. Mai Son, Phu Yen, and Thuan Chau are also useful place names when checking local conditions across this extensive province.
All districts and towns follow UTC+7. The practical distinction is geographic: long distances, winding roads, elevation, and mountain weather can make a single province-wide daylight estimate unsuitable for detailed planning.
Son La city: the administrative center of the province. Moc Chau: a plateau center in southeastern Son La. Phu Yen: a district town toward the east. Thuan Chau: a center northwest of Son La city. Mai Son: a district adjoining the provincial capital area.
How mountains affect sunrise
A published sunrise time is an astronomical calculation for a selected point and date. It cannot describe every valley and slope in Son La equally. A ridge east of an observer may conceal the Sun after geometric sunrise, while an open, elevated viewpoint may receive direct light sooner than a nearby valley floor.
The season changes the length of daylight and the direction from which the Sun rises. The civil time zone remains fixed, so those changes come from Earth’s annual cycle rather than a clock adjustment.
Look up the precise town, village, or coordinates. Use the date of the planned activity. Check whether an eastern ridge blocks the horizon. Treat dawn, sunrise, and full direct sunlight as different conditions.
Questions and answers
- Is Son La in the same time zone as Hanoi?
- Yes. Both use Indochina Time, UTC+7.
- Does elevation change the official time?
- No. Elevation can affect visible sunlight, but not the civil time zone.
- Why can visible sunrise differ from a listed time?
- Mountains, cloud, buildings, and the observer’s horizon can hide the Sun at the calculated instant.