This JST to UTC converter turns any time in Japan Standard Time (JST) into Coordinated Universal Time (UTC), using your device clock so daylight saving is applied automatically. UTC is 9 hours behind JST. JST is UTC+9; UTC is UTC+0.
JST covers Tokyo, Osaka; UTC covers Reykjavik (same clock), servers and aviation. Neither zone observes daylight saving time, so the difference is the same every day of the year.
JST and UTC UTC offsets
JST
UTC+9
Japan Standard Time
No daylight saving time
UTC
UTC+0
Coordinated Universal Time
No daylight saving time
JST to UTC conversion table
| JST | UTC |
|---|---|
| 12 am | 3 pmprevious day |
| 3 am | 6 pmprevious day |
| 6 am | 9 pmprevious day |
| 8 am | 11 pmprevious day |
| 9 am | 12 am |
| 10 am | 1 am |
| 11 am | 2 am |
| 12 pm | 3 am |
| 1 pm | 4 am |
| 2 pm | 5 am |
| 3 pm | 6 am |
| 4 pm | 7 am |
| 5 pm | 8 am |
| 6 pm | 9 am |
| 8 pm | 11 am |
| 10 pm | 1 pm |
Frequently asked questions
What is the time difference between JST and UTC?
UTC is 9 hours behind JST. That comes from the UTC offsets: JST is UTC+9 and UTC is UTC+0. For example, 9 am JST = 12 am UTC.
Is UTC ahead of or behind JST?
UTC is 9 hours behind JST, so when it is noon in JST it is 3 am in UTC. Ahead means the clock there already shows a later time; a call at 5 pm JST lands at 8 am UTC.
Does JST or UTC observe daylight saving time in 2026?
No. Neither JST nor UTC changes its clocks, so the 9 hours difference holds every day of the year. That makes recurring meetings between Tokyo and Reykjavik (same clock) easy to keep at a fixed local time on both ends.
What is the best time for a meeting between JST and UTC?
Office hours (9 am to 5 pm) do not overlap at all with a 9 hours difference. The least painful options are early morning in UTC or early evening in JST; for example 8 am JST = 11 pm UTC the previous day and 6 pm JST = 9 am UTC. Rotate the inconvenient slot between the two sides for recurring calls.
Which cities use JST and UTC?
JST (Japan Standard Time) is used in Tokyo, Osaka. UTC (Coordinated Universal Time) is used in Reykjavik (same clock), servers and aviation. Some cities inside a zone skip daylight saving, noted in parentheses, so their offset matches only part of the year.