GMT to JST: 2026 Time Converter & Meeting Times
GMT is Greenwich Mean Time (UTC+0/+1) and JST is Japan Standard Time (UTC+9). Below is a live conversion with real-time clocks using London and Tokyo as representative cities. DST rules are applied automatically using IANA time zone data.
GMT
Greenwich Mean Time (UTC+0/+1)
JST
Japan Standard Time (UTC+9)
DST
Live auto-detect
Understanding GMT and JST in 2026
Time zone abbreviations like GMT and JST are handy shorthand, but they hide a trap: several regions reuse the same letters, and many switch their underlying offset twice a year for daylight saving. GMT maps to Greenwich Mean Time and JST maps to Japan Standard Time here. Rather than memorising raw offsets, check the live conversion above -- it uses today's date and the IANA time zone database, so you never get it wrong.
For meetings with three or more locations, drop the cities into the meeting planner, which computes the live overlap with daylight saving baked in for every city at once.
Frequently Asked Questions: GMT to JST
What is the time difference between GMT and JST in 2026?
JST (Japan Standard Time, UTC+9) and GMT (Greenwich Mean Time, UTC+0/+1) are in different time zones. The exact gap is shown live above using IANA time zone data. Where a time zone observes daylight saving, the gap shifts by 1 hour seasonally -- this tool always uses the current rule.
When it's 9:00 AM GMT, what time is it in JST?
Check the live hourly conversion table above. Because GMT and JST may each observe DST on different schedules, the conversion depends on the current date. The green rows show when JST is in working hours.
What does GMT stand for?
GMT stands for Greenwich Mean Time, with a UTC offset of UTC+0/+1. JST stands for Japan Standard Time, with a UTC offset of UTC+9. Note that some abbreviations like CST are reused across regions (China Standard Time vs Central Standard Time) -- always check the full time zone name to avoid confusion.
Is GMT the same year-round?
No. GMT (Greenwich Mean Time) changes between standard and daylight time. The standard offset is UTC+0 and the daylight offset is +1.
Is JST the same year-round?
Yes. JST (Japan Standard Time) stays at UTC+9 year-round with no daylight saving adjustments.
What cities use GMT and JST?
GMT (Greenwich Mean Time) includes London, United Kingdom. JST (Japan Standard Time) includes Tokyo, Japan. Use the interactive meeting planner to add specific cities.
How do I convert between GMT and JST for recurring meetings?
Bookmark this page and check it at the start of each season. Because at least one of these time zones observes DST, the conversion may shift by 1 hour during DST transitions. The live table above always uses the current date so you see the correct conversion.