GMT to JST Converter
Greenwich Mean Time (UTC+0:00) → Japan Standard Time (UTC+9:00)
GMT (Greenwich Mean Time)
12:44:35 PM
Wed, Mar 18, 2026
UTC+0:00
9 hours ahead
JST (Japan Standard Time)
09:44:36 PM
Wed, Mar 18, 2026
UTC+9
Time Difference
- GMT offset
- UTC+0:00
- JST offset
- UTC+9:00
- Difference
- 9 hours ahead
- Best overlap
- No business hours overlap
Time Comparison
GMT (Greenwich Mean Time)Greenwich Mean Time12:44 PM
JST (Japan Standard Time)Japan Standard Time9:44 PM
12am
1am
2am
3am
4am
5am
6am
7am
8am
9am
10am
11am
NOW12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
MAR 189am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
MAR 1912am+1d
1am+1d
2am+1d
3am+1d
4am+1d
5am+1d
6am+1d
7am+1d
8am+1d
BusinessMorning/EveningDawn/DuskNight
24-Hour Conversion Table
Based on standard time (Jan 15 reference). Actual times may differ during DST transitions.
| GMT | JST |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM+1 day |
| 4:00 PM | 1:00 AM+1 day |
| 5:00 PM | 2:00 AM+1 day |
| 6:00 PM | 3:00 AM+1 day |
| 7:00 PM | 4:00 AM+1 day |
| 8:00 PM | 5:00 AM+1 day |
| 9:00 PM | 6:00 AM+1 day |
| 10:00 PM | 7:00 AM+1 day |
| 11:00 PM | 8:00 AM+1 day |
Highlighted rows indicate business hours (9 AM–5 PM) in GMT.
What is GMT?
- Full name
- Greenwich Mean Time
- UTC offset
- UTC+0:00
- IANA timezone
- Europe/London
- Observes DST
- Yes
What is JST?
- Full name
- Japan Standard Time
- UTC offset
- UTC+9:00
- IANA timezone
- Asia/Tokyo
- Observes DST
- No
Countries observing GMT
- •United Kingdom (winter)
- •Iceland
- •Ghana
- •Senegal
- •Gambia
- •Sierra Leone
Countries observing JST
- •Japan