Time in JST and AST
The time difference between Japan Standard Time (JST) and Atlantic Standard Time (AST) is 13 hours. Atlantic Standard Time is 13 hours behind Japan Standard Time.
This means 9am JST is 8pm AST (previous day) and 5pm JST is 4am AST.
Japan Standard Time
- The current local time in JST is 4:07 am (July 9, 2026)
- JST time zone offset is UTC+09:00
Atlantic Standard Time
- The current local time in AST is 11:07 pm (July 8, 2026)
- AST time zone offset is UTC-04:00
How to convert Japan Standard Time to Atlantic Standard Time?
Subtract 13 hours from Japan Standard Time to get Atlantic Standard Time.
Time in JST
00:00
Time in AST
00:00
Use the slider above to convert Japan Standard Time to Atlantic Standard Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| JST | AST |
|---|---|
| 12am | 11am |
| 1am | 12pm |
| 2am | 1pm |
| 3am | 2pm |
| 4am | 3pm |
| 5am | 4pm |
| 6am | 5pm |
| 7am | 6pm |
| 8am | 7pm |
| 9am | 8pm |
| 10am | 9pm |
| 11am | 10pm |
| 12pm | 11pm |
| 1pm | 12am |
| 2pm | 1am |
| 3pm | 2am |
| 4pm | 3am |
| 5pm | 4am |
| 6pm | 5am |
| 7pm | 6am |
| 8pm | 7am |
| 9pm | 8am |
| 10pm | 9am |
| 11pm | 10am |