JST to UTC Converter & Meeting Planner
Quick answer: 9:00 AM JST = 12:00 AM UTC (fixed +09:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Japan Standard Time (JST) and Coordinated Universal Time (UTC)? You need to account for the standard time difference. Coordinated Universal Time is normally 9 hours behind Japan Standard Time. Whether you are coordinating between teams in Tokyo and Osaka and Greenwich / London, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM JST = 3:00 PM UTC. The full 24-hour JST to UTC table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM JST = 6:00 AM UTC.
| JST Time | UTC Time |
|---|---|
| 12:00 AM (00:00) | 3:00 PM (15:00)-1 day |
| 1:00 AM (01:00) | 4:00 PM (16:00)-1 day |
| 2:00 AM (02:00) | 5:00 PM (17:00)-1 day |
| 3:00 AM (03:00) | 6:00 PM (18:00)-1 day |
| 4:00 AM (04:00) | 7:00 PM (19:00)-1 day |
| 5:00 AM (05:00) | 8:00 PM (20:00)-1 day |
| 6:00 AM (06:00) | 9:00 PM (21:00)-1 day |
| 7:00 AM (07:00) | 10:00 PM (22:00)-1 day |
| 8:00 AM (08:00) | 11:00 PM (23:00)-1 day |
| 9:00 AM (09:00) | 12:00 AM (00:00) |
| 10:00 AM (10:00) | 1:00 AM (01:00) |
| 11:00 AM (11:00) | 2:00 AM (02:00) |
| 12:00 PM (12:00) | 3:00 AM (03:00) |
| 1:00 PM (13:00) | 4:00 AM (04:00) |
| 2:00 PM (14:00) | 5:00 AM (05:00) |
| 3:00 PM (15:00) | 6:00 AM (06:00) |
| 4:00 PM (16:00) | 7:00 AM (07:00) |
| 5:00 PM (17:00) | 8:00 AM (08:00) |
| 6:00 PM (18:00) | 9:00 AM (09:00) |
| 7:00 PM (19:00) | 10:00 AM (10:00) |
| 8:00 PM (20:00) | 11:00 AM (11:00) |
| 9:00 PM (21:00) | 12:00 PM (12:00) |
| 10:00 PM (22:00) | 1:00 PM (13:00) |
| 11:00 PM (23:00) | 2:00 PM (14:00) |
Best time to call Greenwich / London from Tokyo
For most work calls, compare the normal business day in Tokyo (JST) with the business day in Greenwich / London (UTC). JST commonly covers East Asia, while UTC is mainly associated with Global.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 6:00 PM JST, which reaches 9:00 AM UTC near the start of their workday.
- DST Safety: Neither JST nor UTC uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
🔥 Popular JST & UTC Converters
Frequently searched time zone conversions related to your search.
Related Time Converters
Explore nearby time zone offsets and reverse conversions related to JST and UTC.
Frequently Asked Questions
What is the time difference between JST and UTC?
During standard time, Coordinated Universal Time is 9 hours behind Japan Standard Time.
Does Japan observe Daylight Saving Time?
Japan has not observed Daylight Saving Time since 1951, when the practice introduced during the Allied occupation was abolished by the Japanese government. JST has remained fixed at UTC+9:00 ever since, and there is no current legislation to reintroduce DST in Japan.
Is JST the same as Korean Standard Time (KST)?
Yes, South Korea's Korean Standard Time (KST) operates at the same UTC+9:00 offset as JST, and South Korea also does not observe Daylight Saving Time. The two countries share an identical clock year-round, which simplifies scheduling for the significant trade, technology, and cultural exchange between Tokyo and Seoul.