The Quick Answer

Japan runs on Japan Standard Time (JST), which is UTC+9 all year. Japan does not observe daylight saving time, so its clock never moves. The gap with the United States still changes twice a year, because the US side moves.

While the US is on daylight time (March to November), Tokyo is 13 hours ahead of New York and 16 hours ahead of Los Angeles. On US standard time (November to March) the gap is one hour bigger: 14 hours and 17 hours.

As of October 12, 2026, the hours when people on both sides are realistically awake (8 AM to 10 PM local time) are:

  • From the East Coast: 8 AM – 9 AM Eastern = 9 PM – 10 PM in Tokyo
  • From the East Coast: 7 PM – 10 PM Eastern = 8 AM – 11 AM in Tokyo the next day
  • From the West Coast: 4 PM – 10 PM Pacific = 8 AM – 2 PM in Tokyo the next day

To check your own pair of cities for today’s date, open the time zone planner with New York and Tokyo already selected.

US Time Zone Cheat Sheet

All of Japan shares one time zone, so the math is the same whether you are calling Tokyo, Osaka, Sapporo, or Okinawa. Reading tip: “13 hours ahead” means that when it is 9 AM where you are, it is 10 PM in Tokyo the same day.

While the US is on daylight time (March 8 to November 1, 2026, and again from March 14, 2027):

  • Eastern (EDT, UTC-4): Tokyo is 13 hours ahead. 9 AM New York = 10 PM Tokyo
  • Central (CDT, UTC-5): Tokyo is 14 hours ahead. 9 AM Chicago = 11 PM Tokyo
  • Mountain (MDT, UTC-6): Tokyo is 15 hours ahead. 9 AM Denver = midnight Tokyo the next day
  • Pacific (PDT, UTC-7): Tokyo is 16 hours ahead. 9 AM Los Angeles = 1 AM Tokyo the next day

While the US is on standard time (November 1, 2026 to March 14, 2027):

  • Eastern (EST, UTC-5): Tokyo is 14 hours ahead. 9 AM New York = 11 PM Tokyo
  • Central (CST, UTC-6): Tokyo is 15 hours ahead. 9 AM Chicago = midnight Tokyo the next day
  • Mountain (MST, UTC-7): Tokyo is 16 hours ahead. 9 AM Denver = 1 AM Tokyo the next day
  • Pacific (PST, UTC-8): Tokyo is 17 hours ahead. 9 AM Los Angeles = 2 AM Tokyo the next day

Most of Arizona and all of Hawaii do not change their clocks, so their gap with Japan follows its own pattern. The planner handles both.

When the Gap Changes: Exact Dates

Only the US changes. If you have a standing weekly call, the Japan time of that call shifts by an hour on these dates unless you move it:

  • November 1, 2026: the US ends daylight time. Tokyo goes from 13 hours to 14 hours ahead of New York.
  • March 14, 2027: the US starts daylight time. Tokyo goes from 14 hours to 13 hours ahead of New York.
  • November 7, 2027: the US ends daylight time. Tokyo goes from 13 hours to 14 hours ahead of New York.

Family Calls vs. Work Calls

Work calls: there is no overlap of normal office hours. When it is 9 AM to 5 PM anywhere in the continental US, it is evening or night in Japan. One side always has to stretch. The fairest arrangement is to alternate: one week the US side calls in its evening, the next week the Japan side calls in its evening.

The most workable slot for a US evening call that lands in Japan office hours is 8 PM – 10 PM Eastern = 9 AM – 11 AM in Tokyo the next day.

Family calls: aim for their evening. People are home and relaxed between about 6 and 10 PM. That evening window in Tokyo corresponds to 6 AM – 9 AM Eastern = 7 PM – 10 PM in Tokyo; from the West Coast their evening falls in the middle of your night, so use their morning instead. The typical lunch break there is noon to 1 PM, which is a poor time to call.

The other option is to catch them in the morning before their day starts: 6 PM – 9 PM Eastern = 7 AM – 10 AM in Tokyo the next day and 3 PM – 6 PM Pacific = 7 AM – 10 AM in Tokyo the next day.

What to Know Before You Call Japan

  • Message before you call. An unannounced voice call is unusual in Japan, even between friends. A short message first (LINE is the default messaging app there) asking whether now is a good time is the normal way to start.
  • Avoid the three long holiday periods. New Year (roughly December 29 to January 3) is the biggest family holiday of the year and most offices close. Golden Week (April 29 to May 5) and Obon (around August 13 to 16) empty out offices too. Great times for a family greeting, poor times to expect a business reply.
  • Be exactly on time. If you agreed on 9:00, call at 9:00. Punctuality is read as respect, and being a few minutes late to a scheduled call needs a short apology.
  • Evenings can run late for office workers. Long commutes and long office hours are common in the big cities, so someone with a desk job may not be home by 7 PM on a weekday. Ask what time they usually get in, or use the weekend.

Turn the Time Into an Invitation

Working out the hour is half the job; the other half is making sure the person on the other end reads the same time you meant. In the time zone planner, pick your city and Tokyo, choose a date and time under “Plan a call”, and copy the link. When they open it, the page shows the call in their local time and offers a calendar file. The calculation uses the clock rules for the exact date you picked, so it stays right across the daylight saving changeovers.

These figures were calculated on October 12, 2026 from the IANA time zone database (Asia/Tokyo and the four main US zones). Governments occasionally change their clock rules, so for a date far in the future, check again closer to the time.

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