JST to GMT Converter
Convert time between Japan Standard Time (JST) and Greenwich Mean Time.
Convert a specific time
- IndiaIST, UTC+5:30
- Eastern Time – New YorkEDT, UTC-4
- Central Time – ChicagoCDT, UTC-5
- Mountain Time – DenverMDT, UTC-6
- Arizona – PhoenixMST, UTC-7
- Pacific Time – Los AngelesPDT, UTC-7
- Mexico CityCST, UTC-6
- Saskatchewan – ReginaCST, UTC-6
- UTC / GMTUTC, UTC+0
- United Kingdom – LondonBST, UTC+1
- Central Europe – Paris, BerlinCEST, UTC+2
- Gulf – DubaiGST, UTC+4
- SingaporeSGT, UTC+8
- Japan – TokyoJST, UTC+9
- Australia Eastern – SydneyAEST, UTC+10
- EST (always UTC-5)Fixed offset, no DST
- CST (always UTC-6)Fixed offset, no DST
- MST (always UTC-7)Fixed offset, no DST
- PST (always UTC-8)Fixed offset, no DST
- IndiaIST, UTC+5:30
- Eastern Time – New YorkEDT, UTC-4
- Central Time – ChicagoCDT, UTC-5
- Mountain Time – DenverMDT, UTC-6
- Arizona – PhoenixMST, UTC-7
- Pacific Time – Los AngelesPDT, UTC-7
- Mexico CityCST, UTC-6
- Saskatchewan – ReginaCST, UTC-6
- UTC / GMTUTC, UTC+0
- United Kingdom – LondonBST, UTC+1
- Central Europe – Paris, BerlinCEST, UTC+2
- Gulf – DubaiGST, UTC+4
- SingaporeSGT, UTC+8
- Japan – TokyoJST, UTC+9
- Australia Eastern – SydneyAEST, UTC+10
- EST (always UTC-5)Fixed offset, no DST
- CST (always UTC-6)Fixed offset, no DST
- MST (always UTC-7)Fixed offset, no DST
- PST (always UTC-8)Fixed offset, no DST
Time Difference
Japan Standard Time is 9 hours ahead of Greenwich Mean Time right now.
- All year: Japan Standard Time is 9 hours ahead of Greenwich Mean Time (JST → UTC).
Best time to call
Convenient overlapping hours on Saturday, September 19, 2026.
| JST (Japan Standard Time) | UTC (Greenwich Mean Time) |
|---|---|
| 4:00 PM | 7:00 AM |
| 6:00 PM | 9:00 AM |
| 7:00 PM | 10:00 AM |
| 8:00 PM | 11:00 AM |
No 9 AM–5 PM overlap: suggestions are within working hours on one side and between 7 AM and 10 PM on the other.
Convert another time zone Plan a meeting across JST and GMTJST to GMT conversion table
For Sunday, September 20, 2026 in Japan Standard Time.
| JST | UTC |
|---|---|
| 12:00 AM | 3:00 PM(previous day) |
| 1:00 AM | 4:00 PM(previous day) |
| 2:00 AM | 5:00 PM(previous day) |
| 3:00 AM | 6:00 PM(previous day) |
| 4:00 AM | 7:00 PM(previous day) |
| 5:00 AM | 8:00 PM(previous day) |
| 6:00 AM | 9:00 PM(previous day) |
| 7:00 AM | 10:00 PM(previous day) |
| 8:00 AM | 11:00 PM(previous day) |
| 9:00 AM | 12:00 AM |
| 10:00 AM | 1:00 AM |
| 11:00 AM | 2:00 AM |
| 12:00 PM | 3:00 AM |
| 1:00 PM | 4:00 AM |
| 2:00 PM | 5:00 AM |
| 3:00 PM | 6:00 AM |
| 4:00 PM | 7:00 AM |
| 5:00 PM | 8:00 AM |
| 6:00 PM | 9:00 AM |
| 7:00 PM | 10:00 AM |
| 8:00 PM | 11:00 AM |
| 9:00 PM | 12:00 PM |
| 10:00 PM | 1:00 PM |
| 11:00 PM | 2:00 PM |
About these time zones
Japan Standard Time (JST)
Japan Standard Time (JST) is UTC+9 all year across the whole of Japan. Japan has not observed daylight saving time since 1951. JST shares its offset with Korea Standard Time.
Greenwich Mean Time (GMT)
Greenwich Mean Time (GMT) is the time at UTC+0. GMT and UTC show the same clock time; UTC is the scientific standard, while GMT is a time zone name. The United Kingdom and Ireland use GMT only in winter: in summer the UK switches to British Summer Time (BST, UTC+1) and Ireland to Irish Standard Time (IST, UTC+1).
JST to GMT FAQs
What time is it in GMT when it is 9 AM JST?
On Sunday, September 20, 2026, 9:00 AM JST is 12:00 AM UTC in Greenwich Mean Time.
How many hours ahead is JST from GMT?
Japan Standard Time is 9 hours ahead of Greenwich Mean Time (JST vs UTC).
What is the best time for a call between JST and GMT?
On Saturday, September 19, 2026, good options are 4:00 PM JST (7:00 AM UTC), 6:00 PM JST (9:00 AM UTC), 7:00 PM JST (10:00 AM UTC), 8:00 PM JST (11:00 AM UTC). There is no overlap of 9 AM–5 PM working hours, so these fall early or late for one side.
Does JST change for daylight saving time?
No. JST stays at UTC+9 all year.
Does GMT change for daylight saving time?
No. GMT stays at UTC+0 all year.