Vietnam and US Time Difference: Best Times to Call Vietnam

Last updated November 13, 2026 · Written by Han with AI assistance, fact-checked against official sources.

Vietnam keeps one clock all year, so the gap to the US moves only on the two US clock-change nights.

Compare New York and Ho Chi Minh City on a date of your choice in the Meeting Planner.

Vietnam against every US time zone

Calculated from the time zone database for 2026: January is US standard time, July is US daylight saving time. Phoenix and Honolulu never change, so their gaps stay fixed all year.

Monday morning in Vietnam is still Sunday afternoon or evening everywhere in the US. A 9-to-5 day in Vietnam and a 9-to-5 day in any US city never share an hour, so one side starts early or stays late. A US Sunday evening call lands on Monday morning in Hanoi, as the last column shows.

The 12-hour winter gap

From November to March, New York and Vietnam show the same numbers on the clock with a.m. and p.m. swapped. 7 a.m. Friday in New York is 7 p.m. Friday in Hanoi. 7 p.m. Friday in New York is 7 a.m. Saturday in Hanoi. Every evening in New York is already the next morning in Vietnam, so check the date as well as the hour.

From March to November the gap drops to 11 hours. A New York call at 8 p.m. then reaches Vietnam at 7 a.m., not 8. If you go by the same-number rule from March to November, you will reach Vietnam an hour earlier than you meant.

When the gap changes

US daylight saving time starts on the second Sunday in March and ends on the first Sunday in November. Those two nights change the gap to Vietnam by one hour, and nothing changes in Vietnam. The next change is on Sunday, March 14, 2027, when US clocks spring forward.

A weekly 9 p.m. New York call is at 9 a.m. in Vietnam in winter and 8 a.m. in summer. If the Vietnamese side owns the slot, the US time moves instead. The guide to recurring meetings and clock changes shows what calendar apps do on those weeks.

Best times to call Vietnam from the US

From the East Coast, the evening works best. 8 to 10 p.m. in New York is 8 to 10 a.m. the next day in Vietnam in winter and 7 to 9 a.m. in summer. For a quick family call before work, 7 to 8 a.m. in New York reaches Vietnam at 7 to 8 p.m. in winter and 6 to 7 p.m. in summer.

From the West Coast, start earlier in the evening. 6 to 8 p.m. in Los Angeles is 9 to 11 a.m. the next day in Vietnam in winter and 8 to 10 a.m. in summer. Honolulu is 17 hours behind Vietnam all year, so 3 to 5 p.m. in Honolulu always reaches Vietnam at 8 to 10 a.m. the next morning.

Vietnam and its neighbors

Vietnam shares UTC+7 with Thailand, Cambodia, Laos and western Indonesia. Singapore, Malaysia, the Philippines and China are one hour ahead on UTC+8. Myanmar is half an hour behind Vietnam. None of these places changes its clocks, so a call booked in "Southeast Asia time" can be an hour out depending on the city.

ICT is short for Indochina Time. US readers rarely know the code, so write "Vietnam time" or "UTC+7" in an invite. The Philippines and US guide and the China and US guide cover the UTC+8 side.

When Saigon was an hour ahead of Hanoi

Vietnam has used one clock only since 1975. The time zone database records that South Vietnam moved its clocks forward one hour at 11 p.m. on December 31, 1959, to UTC+8, while the North stayed on UTC+7. After the war ended, Saigon clocks went back from midnight to 11 p.m. on June 12, 1975, and the whole country has been on UTC+7 since June 13, 1975.

In January 1970, Saigon was 13 hours ahead of New York, one hour more than the winter gap today.

Quick checks before you book

• Count the date as well as the hour. An evening call from the US is the next morning in Vietnam.
• Check the weeks after the second Sunday in March and the first Sunday in November. A call fixed in US time moves by an hour in Vietnam.
• Write both cities in the invite. On the US side, EST is only correct in winter; from March to November it is EDT.

Open the Meeting Planner to test a time, or see the city pages for Ho Chi Minh City, Bangkok, New York and Los Angeles. The Asia time zones guide covers the rest of the region, and South Korea and US Time Difference works through another country that keeps one clock all year.