This UTC to JST converter turns any time in Coordinated Universal Time (UTC) into Japan Standard Time (JST), using your device clock so daylight saving is applied automatically. JST is 9 hours ahead of UTC. UTC is UTC+0; JST is UTC+9.
UTC covers Reykjavik (same clock), servers and aviation; JST covers Tokyo, Osaka. Neither zone observes daylight saving time, so the difference is the same every day of the year.
UTC and JST UTC offsets
UTC
UTC+0
Coordinated Universal Time
No daylight saving time
JST
UTC+9
Japan Standard Time
No daylight saving time
UTC to JST conversion table
| UTC | JST |
|---|---|
| 12 am | 9 am |
| 3 am | 12 pm |
| 6 am | 3 pm |
| 8 am | 5 pm |
| 9 am | 6 pm |
| 10 am | 7 pm |
| 11 am | 8 pm |
| 12 pm | 9 pm |
| 1 pm | 10 pm |
| 2 pm | 11 pm |
| 3 pm | 12 amnext day |
| 4 pm | 1 amnext day |
| 5 pm | 2 amnext day |
| 6 pm | 3 amnext day |
| 8 pm | 5 amnext day |
| 10 pm | 7 amnext day |
Frequently asked questions
What is the time difference between UTC and JST?
JST is 9 hours ahead of UTC. That comes from the UTC offsets: UTC is UTC+0 and JST is UTC+9. For example, 9 am UTC = 6 pm JST.
Is JST ahead of or behind UTC?
JST is 9 hours ahead of UTC, so when it is noon in UTC it is 9 pm in JST. Ahead means the clock there already shows a later time; a call at 5 pm UTC lands at 2 am JST.
Does UTC or JST observe daylight saving time in 2026?
No. Neither UTC nor JST changes its clocks, so the 9 hours difference holds every day of the year. That makes recurring meetings between Reykjavik (same clock) and Tokyo easy to keep at a fixed local time on both ends.
What is the best time for a meeting between UTC and JST?
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 UTC = 5 pm JST and 6 pm UTC = 3 am JST the next day. Rotate the inconvenient slot between the two sides for recurring calls.
Which cities use UTC and JST?
UTC (Coordinated Universal Time) is used in Reykjavik (same clock), servers and aviation. JST (Japan Standard Time) is used in Tokyo, Osaka. Some cities inside a zone skip daylight saving, noted in parentheses, so their offset matches only part of the year.