A 20:00 dinner in Yokohama lands on a New York desk at 06:00 in January. Book the call for your evening, not your morning. The offset is either 13 or 14 hours, and the US clock change decides which one applies.
JST (UTC+9) vs EST (UTC‑5): the 14‑hour gap
From November to March, New York runs on Eastern Standard Time, UTC‑5. Yokohama stays fixed on Japan Standard Time, UTC+9. The gap is 14 hours.
Yokohama 20:00-22:00 lines up with New York 06:00-08:00. That is the only usable weekday window. Try calling earlier and you reach the US East Coast in the middle of the night.
JST (UTC+9) vs EDT (UTC‑4): the 13‑hour gap
From March to November, New York shifts to Eastern Daylight Time, UTC‑4. The gap shrinks to 13 hours.
Yokohama 20:00-22:00 now matches New York 07:00-09:00. Still a morning call for New York, but one hour later. The window stays two hours long and slides forward by one hour.
Why the Yokohama, New York offset jumps twice a year
Only the US side moves. Japan has not observed daylight saving time since 1951.
- Second Sunday in March: New York springs forward. The gap drops from 14 to 13 hours overnight.
- First Sunday in November: New York falls back. The gap returns to 14 hours.
In 2026, the shift to EDT happens on 8 March. The shift back to EST happens on 1 November. Mark both dates. A recurring calendar invite set for Yokohama 20:00 will silently jump by one hour in New York.
When to schedule a call between Yokohama and New York
Skip Yokohama mornings for calls to New York. At 09:00 JST, New York is 19:00 or 20:00 the previous day, well past the end of a typical US workday.
Book the Yokohama evening slot. Aim for 20:00-22:00 JST. That hits 06:00-08:00 EST in winter or 07:00-09:00 EDT in summer. It is the only overlap where both sides are awake and working.
From New York, schedule your calls for 06:00-09:00 in winter or 07:00-09:00 in summer. That puts you in Yokohama’s evening, when colleagues are still at their desks or available for dinner meetings.
Yokohama to New York conversion at a glance
| Yokohama time | New York (winter / EST) | New York (summer / EDT) |
|---|---|---|
| 08:00 | 18:00 (previous day) | 19:00 (previous day) |
| 12:00 | 22:00 (previous day) | 23:00 (previous day) |
| 17:00 | 03:00 | 04:00 |
| 20:00 | 06:00 | 07:00 |
| 22:00 | 08:00 | 09:00 |
| 23:59 | 09:59 | 10:59 |
Bold rows are your safe calling window. Outside that band you hit New York before 06:00 or after 09:00, too early or too late for a business call.
For calling times from other locations, see the Best Times to Call Yokohama. If you are flying between the two cities, the Yokohama Jet Lag Guide explains how to adjust.
Next change: 8 March 2026. New York switches to EDT. The 14‑hour gap becomes 13 hours. A 20:00 Yokohama call will reach New York at 07:00 instead of 06:00. Update recurring invites before that Sunday.