JST vs GMT Time Difference
See the live time difference between Japan Standard Time and Greenwich Mean Time, check DST impacts, and find practical meeting hours.
Current Time Difference
Japan Standard Time is UTC+9 and Greenwich Mean Time is UTC+0, so JST is 9 hours ahead of GMT. View the current offset and compare both zones hour by hour.
Track DST Changes
JST does not observe daylight saving time, while GMT may differ from UK summer time during DST periods. The page tracks seasonal changes automatically using the IANA timezone database.
Find Best Meeting Times
Use the visual comparison grid to spot overlapping work hours between JST and GMT. Review hour-by-hour tables and export selected times with ICS, Google Calendar, or Gmail.
How to Find the Time Difference Between JST and GMT
Open the JST vs GMT converter: Go to https://www.xconvert.com/time-converter/jst-vs-gmt to open a comparison grid with Japan Standard Time and Greenwich Mean Time already loaded. This view is useful when you are planning a call with colleagues in Japan while coordinating with teams, clients, or partners working on GMT schedules in the United Kingdom, Ghana, or Iceland.
Add comparison cities if your schedule involves more than two regions: Click + Add City and search for cities that matter to your workflow, such as Tokyo for Japan-based operations, London for UK business coordination, or Accra for West Africa-based support and logistics. This is especially helpful for finance, shipping, gaming, manufacturing, and customer support teams that need to line up JST working hours with GMT-based offices.
Drag across the grid to compare a meeting window: Click Select if needed, then drag on the colored timeline to highlight a time range in purple; you can resize it with the left and right handles or move the whole block by dragging the center. For example, selecting 9:00 JST to 12:00 JST shows 0:00 GMT to 3:00 GMT, while 15:00 JST to 18:00 JST shows 6:00 GMT to 9:00 GMT, which helps you see immediately whether a Tokyo afternoon meeting lands in the middle of the night or early morning for GMT participants.
Export the selected time for your team or clients: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical for sending a confirmed handoff window to a Japan-based engineering team, creating a calendar invite for a UK stakeholder, or sharing a link with distributed operations staff so everyone sees the same meeting slot in their own local context.
JST vs GMT Offset Explained
Japan Standard Time is UTC+9, and Greenwich Mean Time is UTC+0. That means GMT is 9 hours behind JST, and equivalently, JST is 9 hours ahead of GMT. In practical terms, when it is 9:00 JST, it is 0:00 GMT; when it is 12:00 JST, it is 3:00 GMT.
This gap matters most when teams try to overlap standard business hours. A typical morning in Japan often falls during the overnight period in GMT, while a late afternoon block in Japan maps to the early morning in GMT. The examples make this clear: 15:00 JST = 6:00 GMT and 18:00 JST = 9:00 GMT, so a Japan afternoon meeting can be one of the earliest workable times for GMT-based participants.
Seasonal changes are simpler on the Japan side because JST does not observe DST. GMT is a standard-time abbreviation, and its daylight saving counterpart is BST, so users comparing Japan with the United Kingdom need to be careful about whether they mean wintertime GMT specifically or the UK’s summer clock. That distinction is important for international sales calls, airline operations, and remote team scheduling because the UK may not always be on GMT year-round even though GMT remains the baseline reference.
JST is used in Japan, making it the standard reference for business in Tokyo, Osaka, Nagoya, Fukuoka, and other Japanese commercial centers. GMT is used across a wider set of countries and territories, including the United Kingdom, Ghana, Iceland, Ireland, Senegal, Sierra Leone, Liberia, Guinea, Guinea-Bissau, Mali, Mauritania, Togo, Gambia, Burkina Faso, Saint Helena, Sao Tome and Principe, Guernsey, Jersey, Isle of Man, and Ivory Coast, so the same JST-to-GMT comparison can support everything from UK media coordination to West African trade and nonprofit scheduling.
When JST and GMT Work Best for Meetings
Because the time difference is a fixed 9 hours, the best overlap usually comes from late afternoon in Japan paired with early morning in GMT. Using the examples on this page, 15:00 JST = 6:00 GMT and 18:00 JST = 9:00 GMT, so that three-hour block is often the most realistic shared window for teams that need live discussion rather than asynchronous updates.
This pattern is common in industries where Japan works closely with GMT regions. Japanese manufacturers may need early-day updates from UK or West African partners, gaming and software teams may schedule release coordination between Tokyo and London-adjacent operations, and logistics teams can use the grid to confirm whether a same-day handoff is possible before Japan closes business for the day.
If the meeting must happen during the Japanese morning, the GMT side will usually be in the middle of the night. For example, 9:00 JST = 0:00 GMT and 12:00 JST = 3:00 GMT, so a Tokyo morning standup is generally unsuitable for live attendance from GMT-based participants unless the call is urgent, rotational, or intended for overnight operations staff.
Countries and Practical Use Cases for JST and GMT
JST applies to Japan, one of the world’s major centers for automotive manufacturing, electronics, robotics, finance, and international shipping. Teams dealing with suppliers, headquarters, or clients in Japan often need precise JST comparisons for procurement deadlines, software deployments, investor calls, and airport or port coordination.
GMT spans a broad set of countries and territories across Europe, West Africa, and the Atlantic. That makes JST-to-GMT conversion useful not just for UK business calls, but also for scheduling with organizations in Ghana, Senegal, Sierra Leone, Liberia, Iceland, Ireland, and other GMT locations where teams may be handling customer service, development support, education, government work, or regional trade.
For travel planning, the 9-hour gap is also useful when reviewing departure briefings, hotel check-in communications, or airport transfer arrangements. A message sent for 18:00 JST reaches someone on a 9:00 GMT schedule, which can align well with the start of a workday in GMT regions and reduce missed calls or delayed confirmations.
Frequently Asked Questions
What is the time difference between JST and GMT?
GMT is 9 hours behind JST, and JST is 9 hours ahead of GMT. This means a time that feels like the start of the business day in Japan can still be midnight in GMT, such as 9:00 JST = 0:00 GMT.
Is JST always 9 hours ahead of GMT?
Yes. JST is UTC+9 and GMT is UTC+0, so the difference on this page is a fixed 9 hours. Since JST does not observe DST, the Japan side stays stable throughout the year.
Does daylight saving time affect JST vs GMT?
Japan does not change clocks because JST does not observe DST. GMT itself is a standard-time abbreviation, and its daylight saving counterpart is BST, so users comparing Japan with the United Kingdom should make sure they are distinguishing GMT from UK summer time when scheduling recurring meetings.
What time is 9 AM JST in GMT?
9:00 JST = 0:00 GMT. This is important for remote teams because a morning meeting in Tokyo lands exactly at midnight for someone working on a GMT schedule.
What time is noon in Japan Standard Time in Greenwich Mean Time?
12:00 JST = 3:00 GMT. That still falls very early in the day for GMT-based participants, so it is usually better for asynchronous updates than for a live call unless the GMT side starts work unusually early.
What time is 3 PM JST in GMT?
15:00 JST = 6:00 GMT. This is one of the more practical options for cross-regional meetings because it places Japan in mid-afternoon and GMT at the early start of the workday.
What time is 6 PM JST in GMT?
18:00 JST = 9:00 GMT. For many teams, this is the clearest overlap for a live meeting because it reaches a normal morning hour in GMT while still staying within the late business day in Japan.
Which countries use JST and which countries use GMT?
JST is used in Japan. GMT is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom, making this comparison useful for a wide range of business, travel, and coordination scenarios.
Is GMT the same as UK time when comparing with Japan?
Not always. GMT is the United Kingdom’s standard-time reference, but the UK also uses BST as its daylight saving counterpart. If you are scheduling with London while comparing against Japan, confirm whether the UK side is specifically on GMT or on BST for that date.