Time difference between Hanoi and San Francisco
15 hours
Hanoi is 15 hours ahead of San Francisco.
Does daylight saving change it?
Yes. In winter the gap is 15 hours; in summer it is 14 hours. Only San Francisco observes daylight saving.
Overlapping work hours
During Hanoi work hours (09:00–18:00) San Francisco is off the clock. One side has to take an early morning or a late evening.
Hanoi time → San Francisco time
| 00:00 | 09:00prev day |
|---|---|
| 01:00 | 10:00prev day |
| 02:00 | 11:00prev day |
| 03:00 | 12:00prev day |
| 04:00 | 13:00prev day |
| 05:00 | 14:00prev day |
| 06:00 | 15:00prev day |
| 07:00 | 16:00prev day |
| 08:00 | 17:00prev day |
| 09:00 | 18:00prev day |
| 10:00 | 19:00prev day |
| 11:00 | 20:00prev day |
| 12:00 | 21:00prev day |
| 13:00 | 22:00prev day |
| 14:00 | 23:00prev day |
| 15:00 | 00:00 |
| 16:00 | 01:00 |
| 17:00 | 02:00 |
| 18:00 | 03:00 |
| 19:00 | 04:00 |
| 20:00 | 05:00 |
| 21:00 | 06:00 |
| 22:00 | 07:00 |
| 23:00 | 08:00 |
Standard time (January). During daylight saving each row shifts by an hour.
Frequently asked questions
Q. How many hours is Hanoi ahead of San Francisco?
15 hours on standard time. During daylight saving it becomes 14 hours, an hour more or less.
Q. What time is it in San Francisco when it is noon in Hanoi?
Read the 12:00 row of the 24-hour table below. The table is on standard time, so each row shifts an hour during daylight saving.
Q. When should we schedule a meeting?
The work hours do not overlap at all. One side has to take an early morning or a late evening.