Does Japan use daylight saving time?

No. Japan observed DST from 1948 to 1951 under American occupation but abolished it due to widespread public opposition. The country has used UTC+9 year-round ever since, making it one of the easiest time zones to schedule around because the offset never changes.

What is the time difference between JST and US time zones?

JST is 14 hours ahead of Eastern Standard Time (EST, UTC-5) and 17 hours ahead of Pacific Standard Time (PST, UTC-8). During US daylight saving time, those gaps shrink to 13 and 16 hours respectively. The large difference means same-day overlap is limited to early morning in Japan or late afternoon in the US.

Why does Japan use a single time zone?

Japan spans only about 25 degrees of longitude from its westernmost to easternmost points, and the main islands cover an even narrower range. The variation in solar time is modest enough that a single zone at UTC+9 serves the entire country without significant inconvenience.

Japan Standard Time (JST) Explained

April 16, 2026

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Frequently Asked Questions

Does Japan use daylight saving time?: No. Japan observed DST from 1948 to 1951 under American occupation but abolished it due to widespread public opposition. The country has used UTC+9 year-round ever since, making it one of the easiest time zones to schedule around because the offset never changes.
What is the time difference between JST and US time zones?: JST is 14 hours ahead of Eastern Standard Time (EST, UTC-5) and 17 hours ahead of Pacific Standard Time (PST, UTC-8). During US daylight saving time, those gaps shrink to 13 and 16 hours respectively. The large difference means same-day overlap is limited to early morning in Japan or late afternoon in the US.
Why does Japan use a single time zone?: Japan spans only about 25 degrees of longitude from its westernmost to easternmost points, and the main islands cover an even narrower range. The variation in solar time is modest enough that a single zone at UTC+9 serves the entire country without significant inconvenience.