Compare JST and GMT
See the current JST to GMT time difference, check DST impacts, and find the best hours to schedule calls and meetings.
Current Time Difference
JST is UTC+9 while GMT is UTC+0, so the standard time difference is 9 hours. Use this page to compare current local times and working-hour overlap at a glance.
DST Impact Tracking
Japan Standard Time does not observe daylight saving time, while regions using GMT may switch to BST in summer. The page tracks these seasonal changes automatically using the IANA timezone database.
Best Meeting Hours
Review hour-by-hour comparison tables and visual overlap grids to find practical meeting times between JST and GMT. Export selected times with ICS download or add them to Google Calendar and Gmail.
How to Find the Time Difference Between JST and GMT
Open the JST vs GMT page: Visit
https://www.xconvert.com/time-converter/jst-vs-gmtto load a comparison grid with JST and GMT ready to view side by side. This is useful when you are planning a call with colleagues in Japan while coordinating with teams, clients, or partners in the United Kingdom, Ghana, or Iceland that work on GMT.Add comparison cities if your schedule involves more locations: 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 African teams using GMT. This is especially practical for finance, logistics, gaming, manufacturing, and customer support teams that need to line up Japan business hours with GMT-based offices.
Select the meeting window on the grid: Click Select to enter selection mode, then drag across the colored timeline on the JST row to highlight a time range in purple. For example, drag from 9:00 JST to 12:00 JST to see that this matches 0:00 GMT to 3:00 GMT, which quickly shows that a standard Tokyo morning overlaps with midnight to early morning in GMT locations and may not suit a live business call.
Adjust and export the result: Drag the center of the purple selection to move the whole block, or use the left and right handles to resize it until you find a workable overlap. Once selected, use ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link to send the agreed time to remote teams, travel coordinators, or international clients so everyone receives the meeting in their own local context.
JST vs GMT Offset Explained
Japan Standard Time is UTC+9, while Greenwich Mean Time is UTC+0. JST is therefore 9 hours ahead of GMT, which means GMT is -9 hours behind JST. In practical scheduling terms, when it is 9:00 JST, it is 0:00 GMT, and when it is 18:00 JST, it is 9:00 GMT.
JST is used in Japan and does not observe DST, so its offset stays fixed at UTC+9 throughout the year. That consistency is valuable for manufacturing coordination, software releases, shipping schedules, and investor communications tied to Tokyo because the Japan side of the schedule does not shift seasonally.
GMT is a standard-time abbreviation, and its DST counterpart is IST. That matters because some places commonly associated with GMT, especially the United Kingdom and Ireland, may use a daylight-saving schedule in part of the year, so the label on the clock can change even though this page specifically compares JST to GMT. If you are arranging recurring meetings with London-based teams, seasonal clock changes can affect the meeting hour even though Japan stays on the same time all year.
GMT is used across a wide set of countries and territories, including 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. This makes JST vs GMT comparisons relevant not only for Japan-UK business, but also for NGOs, shipping operators, commodity traders, and distributed support teams working between Japan and West Africa or Atlantic locations.
A few quick conversion points make the offset easier to remember. 9:00 JST = 0:00 GMT, 12:00 JST = 3:00 GMT, 15:00 JST = 6:00 GMT, and 18:00 JST = 9:00 GMT. These examples show that a normal afternoon in Japan still lands in the early morning for GMT users, which often makes late-day JST meetings more practical than early-day ones when you need live participation from both sides.
Frequently Asked Questions
What is the time difference between JST and GMT?
JST is 9 hours ahead of GMT, and GMT is -9 hours behind JST. A simple way to see it is through the common example 9:00 JST = 0:00 GMT, which shows that the start of the business day in Japan falls at midnight in GMT.
Is JST always 9 hours ahead of GMT?
Yes. Japan Standard Time is UTC+9 and does not observe DST, so the JST side of the comparison stays the same all year. The GMT side is UTC+0 when using GMT, so the JST vs GMT difference remains 9 hours for this comparison.
Does Japan use daylight saving time?
No. JST does not observe DST, which means Japan keeps the same standard time throughout the year. This is helpful for recurring meetings, production schedules, and cross-border project planning because Japanese office hours do not shift seasonally.
Does GMT change during daylight saving time?
GMT itself is a standard-time abbreviation, and its DST counterpart is IST. This is important for users working with the United Kingdom or Ireland, because a meeting labeled against GMT in winter may be labeled differently during the daylight-saving period, even though Japan remains on JST year-round.
What countries use JST and 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 broad range of international business and travel scenarios.
What is 12:00 JST in GMT?
12:00 JST = 3:00 GMT. This means a noon update from Tokyo reaches GMT-based teams in the very early morning, which is often too early for live attendance and better suited to asynchronous handoffs, emailed reports, or scheduled calendar invites.
What is 15:00 JST in GMT?
15:00 JST = 6:00 GMT. For remote teams, this shows that a mid-afternoon meeting in Japan still lands before the normal workday begins in many GMT locations, so it may work better for operations staff starting early than for a full office meeting.
What is 18:00 JST in GMT?
18:00 JST = 9:00 GMT. This is one of the more practical overlap points for real-time collaboration because a late-day slot in Tokyo aligns with a standard morning hour in GMT, which can work well for executive calls, supplier coordination, and cross-border project reviews.
When is the best time to schedule a meeting between JST and GMT?
The most workable live overlap is often found by using later hours in JST, because earlier Japanese business hours map to midnight or pre-dawn in GMT. The examples 15:00 JST = 6:00 GMT and 18:00 JST = 9:00 GMT show why many teams prefer late afternoon or early evening in Japan when they need real-time participation from GMT-based offices.