Japan Standard Time

Frequently asked questions

Common questions about JST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].

Why doesn’t Japan observe daylight saving time?

Japan abolished DST after World War II, and despite periodic debates, concerns over increased energy use, disrupted work rhythms, and public preference for consistency have kept the country firmly on permanent standard time.

Is JST used outside of Japan?

While ‘Japan Standard Time’ technically only applies to Japan, several neighboring regions like Seoul and Pyongyang also use UTC+09:00 year-round under different names—but they don’t officially call it JST.

How does fixed UTC+09:00 affect daily life in Tokyo?

With no DST shifts, schedules stay predictable—train timetables, TV broadcasts, and business hours remain constant all year, making coordination seamless for residents and visitors alike.

What’s the earliest sunrise in Tokyo under JST?

In early June, Tokyo sees sunrise as early as 4:25 a.m. local time—thanks to its eastern longitude and lack of DST adjustments, mornings get bright well before most people wake up.

Does Japan ever consider switching to DST?

Occasionally, especially around major events like the Olympics, there’s talk of adopting DST to align with global partners or save energy—but strong cultural attachment to routine and skepticism about benefits have blocked any change so far.

How does JST compare to other Asian time zones?

JST is one of the few major Asian time zones that never changes; while countries like South Korea experimented with DST in the past, Japan has maintained uninterrupted consistency since 1951.

Is there any part of Japan that uses a different time zone?

No—every corner of Japan, from Hokkaido to Okinawa, follows the same UTC+09:00 without exception, making it one of the most uniformly timed nations in the world.