Read both clocks before planning sleep.
| BOS clock | NRT clock | Destination date |
|---|---|---|
| 07:00 | 20:00 | Oct 26 |
| 12:00 | 01:00 | Oct 27 |
| 18:00 | 07:00 | Oct 27 |
| 22:00 | 11:00 | Oct 27 |
January 15, 2027: +14 hours; July 15, 2027: +13 hours (destination minus origin). The difference changes seasonally, so a saved offset can be wrong for another departure date.
Westward travel often asks for a later body-clock schedule. Holding out for an appropriate local bedtime can be difficult when the departure clock already feels late.
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 BOS evening row above beside the NRT clock. If feasible, make a modest sleep-schedule shift toward your destination without cutting your sleep short.
Flight day
Keep the ticket’s BOS departure date and NRT 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 Tokyo Narita 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 BOS to NRT time difference?
On 2026-10-26, Tokyo Narita is 13 hours ahead of Boston. Seasonal offset examples: January 15, 2027: +14 hours; July 15, 2027: +13 hours (destination minus origin). The difference changes seasonally, so a saved offset can be wrong for another departure date.
Is this an westward trip?
The shorter geographic direction from BOS to NRT is westward. 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.