The short answer: Tokyo (JST, UTC+9) is 13 hours ahead of New York during US daylight saving and 14 hours ahead in US winter. There is essentially no shared working day. The best contact window is New York morning, which is Tokyo evening: when it is 9:00 AM in New York it is about 10:00 PM the same day in Tokyo (summer).
New York and Tokyo sit almost exactly half a world apart, so there is no hour that is mid-afternoon in both places. The same offset that rules out daytime-to-daytime calls makes your morning to Tokyo's evening the one window that works.
How far ahead is Tokyo?
Japan keeps a single time zone, Japan Standard Time, at UTC+9, and it does not change for daylight saving. New York does, so the gap depends on the US season.
| Period | Tokyo is ahead of New York |
|---|---|
| US summer (daylight saving) | 13 hours |
| US winter (standard time) | 14 hours |
When it's X in New York, what time is it in Tokyo?
Because Tokyo is 13 hours ahead in US summer, your morning is their late evening of the same day, and your evening is the next morning for them.
| New York (ET) | Tokyo (JST), US summer | Tokyo (JST), US winter |
|---|---|---|
| 9:00 AM | 10:00 PM same day | 11:00 PM same day |
| 12:00 PM | 1:00 AM next day | 2:00 AM next day |
| 5:00 PM | 6:00 AM next day | 7:00 AM next day |
| 8:00 PM | 9:00 AM next day | 10:00 AM next day |
So a New York morning catches Tokyo in the evening, and a New York evening catches Tokyo at the start of the next working day.
The best windows to connect
With no overlapping office hours, pick one of two reliable handshakes. In US summer, New York 8:00 AM is about 9:00 PM in Tokyo, the end of their evening; New York 6:00 PM is around 7:00 AM the next day in Tokyo, just before their workday. Choose your morning for a relaxed Tokyo evening, or your evening for an early Tokyo start.
Tokyo never changes its clocks, but New York springs forward in March and falls back in November, so the gap moves between 13 and 14 hours. A recurring call set in summer will land an hour off in winter unless you adjust it. New York runs on Eastern Time, so it helps to know what EST is.
Stop checking this every time
If you work with Tokyo regularly, doing this 13-hour arithmetic by hand gets old fast, and it's exactly where the daylight-saving slips happen. Atlas keeps New York and Tokyo side by side in your Mac menu bar, shades the few hours when both sides are awake, and books any meeting to your calendar in both local times. One glance tells you whether now is a sensible time to call.
Frequently asked
What is the time difference between New York and Tokyo?
When it is 9 AM in New York, what time is it in Tokyo?
What is the best time to call Tokyo from New York?
Does Tokyo observe daylight saving time?
Stop doing timezone math
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