There is no standard 8-to-6 overlap. Someone joins early or late.
Ho Chi Minh City and San Francisco have no natural overlap. The 14-hour gap is simply too large for regular working hours to meet. Treat the handoff like a relay — San Francisco wraps up and leaves notes for Ho Chi Minh City to pick up as their day begins. One seasonal catch: San Francisco springs forward and falls back, but Ho Chi Minh City doesn't, so the gap changes by an hour for several months of the year.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ho Chi Minh City Asia/Ho Chi Minh | ||||||||||||||||||||||||
San Francisco America/Los Angeles |
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