Read both clocks before planning sleep.
| HND clock | SFO clock | Destination date |
|---|---|---|
| 07:00 | 15:00 | Oct 25 |
| 12:00 | 20:00 | Oct 25 |
| 18:00 | 02:00 | Oct 26 |
| 22:00 | 06:00 | Oct 26 |
January 15, 2027: -17 hours; July 15, 2027: -16 hours (destination minus origin). The difference changes seasonally, so a saved offset can be wrong for another departure date.
Eastward travel often asks for an earlier body-clock schedule. A smaller pre-trip advance can help some travelers, while a late bedtime in the departure city may make the first local night harder.
An example shape for this trip.
An educational example, not a personal schedule. Precise light timing depends on your internal clock as well as the itinerary.
Two or three days before departure
Look at the HND evening row above beside the SFO clock. If feasible, make a modest sleep-schedule shift toward your destination without cutting your sleep short.
Flight day
Keep the ticket’s HND departure date and SFO arrival date visible. Plan a realistic opportunity to rest; avoid relying on alcohol for sleep. Caffeine close to intended sleep can make rest harder.
First local day
Use San Francisco local time for meals, activities and the coming bedtime. This large civil-clock gap crosses a calendar boundary in many schedules. Do not turn the printed hour difference into hours of forced wakefulness. Check both arrival date and clock time before planning rest.
Following days
Recheck how rested you feel before adding demanding activities. General advice is not a promise of a fixed adjustment time; use your personalized schedule and clinical guidance when appropriate.
Sources · CDC jet lag guidance · Airline route/network reference · checked 2026-10-26
Airline service and dates can change. This is a travel-planning guide, not a timetable or a claim that a nonstop flight operates on your date. Flight-duration estimates are omitted.
A few useful answers.
What is the HND to SFO time difference?
On 2026-10-26, San Francisco is 16 hours behind Tokyo Haneda. Seasonal offset examples: January 15, 2027: -17 hours; July 15, 2027: -16 hours (destination minus origin). The difference changes seasonally, so a saved offset can be wrong for another departure date.
Is this an eastward trip?
The shorter geographic direction from HND to SFO is eastward. Direction and civil-clock offset are different concepts, especially around the date line. Neither alone determines your personal light schedule.
Is the sample a personal plan?
No. It is an educational outline, not advice for your sleep schedule or health. The app uses your itinerary and usual sleep to create a plan; your first complete itinerary is free.