JST to Cardiff Time Converter
GMT is 9 hours behind JST. 9:00 AM JST = 12:00 AM GMT.
GMT is 9 hours behind JST at the moment. To convert JST to Cardiff Time, subtract 9 hours from the JST time: 9:00 AM JST = 12:00 AM GMT.
JST (Japan Time) is used in Japan. Cardiff Time (Cardiff time) is used in Cardiff, UK.
JST to Cardiff Time time conversion table
JST to Cardiff Time on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| JST | Cardiff Time | Day |
|---|---|---|
| 12:00 AM JST | 3:00 PM GMT | previous day |
| 1:00 AM JST | 4:00 PM GMT | previous day |
| 2:00 AM JST | 5:00 PM GMT | previous day |
| 3:00 AM JST | 6:00 PM GMT | previous day |
| 4:00 AM JST | 7:00 PM GMT | previous day |
| 5:00 AM JST | 8:00 PM GMT | previous day |
| 6:00 AM JST | 9:00 PM GMT | previous day |
| 7:00 AM JST | 10:00 PM GMT | previous day |
| 8:00 AM JST | 11:00 PM GMT | previous day |
| 9:00 AM JST | 12:00 AM GMT | night |
| 10:00 AM JST | 1:00 AM GMT | night |
| 11:00 AM JST | 2:00 AM GMT | night |
| 12:00 PM JST | 3:00 AM GMT | night |
| 1:00 PM JST | 4:00 AM GMT | night |
| 2:00 PM JST | 5:00 AM GMT | night |
| 3:00 PM JST | 6:00 AM GMT | — |
| 4:00 PM JST | 7:00 AM GMT | — |
| 5:00 PM JST | 8:00 AM GMT | — |
| 6:00 PM JST | 9:00 AM GMT | — |
| 7:00 PM JST | 10:00 AM GMT | — |
| 8:00 PM JST | 11:00 AM GMT | — |
| 9:00 PM JST | 12:00 PM GMT | — |
| 10:00 PM JST | 1:00 PM GMT | — |
| 11:00 PM JST | 2:00 PM GMT | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert JST to Cardiff Time
Subtract 9 hours from the JST time to get Cardiff Time.
Example: 9:00 AM JST = 12:00 AM GMT.
Across midnight: 1:00 AM JST = 4:00 PM GMT (previous day). The date changes, so always check the day as well as the hour.
Time difference between JST and Cardiff Time
The time difference between JST and Cardiff Time is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 28 Mar 2026: Cardiff Time is 9 hours behind of JST.
- 29 Mar 2026 – 24 Oct 2026: Cardiff Time is 8 hours behind of JST.
- 25 Oct 2026 – 31 Dec 2026: Cardiff Time is 9 hours behind of JST.
JST and Cardiff Time during daylight saving time
- JST does not observe daylight saving time; it stays on UTC+9 all year.
- Cardiff Time next changes on 28 Mar 2027: clocks go forward one hour at 00:59 local time, from GMT (UTC+0) to BST (UTC+1).
Best time for a meeting between JST and Cardiff Time
JST and Cardiff Time have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM JST, which is 10:00 PM GMT.
JST to Cardiff Time FAQ
What is the time difference between JST and Cardiff Time?
Right now GMT is 9 hours behind JST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM JST in Cardiff Time?
9:00 AM JST is 12:00 AM GMT.
What is 12 PM (noon) JST in Cardiff Time?
12:00 PM JST is 3:00 AM GMT.
Is Cardiff Time ahead of or behind JST?
GMT is 9 hours behind JST, so it is earlier in Cardiff Time than in JST.
Does JST change for daylight saving time?
No. JST stays on the same offset all year, so conversions never shift for daylight saving time.
Does Cardiff Time change for daylight saving time?
Yes. Cardiff Time next changes on 28 Mar 2027, when clocks go forward one hour from GMT to BST.
What is the best time for a meeting between JST and Cardiff Time?
JST and Cardiff Time have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM JST, which is 10:00 PM GMT.
Related conversions
Convert Cardiff Time to JST
Convert JST to other time zones
Convert other time zones to Cardiff Time
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.