JSTtoESTJapan Standard Time to Eastern Standard Time
JST
Japan Standard Time (GMT+9)EST
Eastern Standard Time (EDT)Feasible Shoulder Hours Window
Recommended calling window between JST and EST
There are no overlapping 9-to-5 working hours between JST and EST. The optimal compromise window falls during morning/evening shoulder periods (7:00 AM – 9:00 PM) when participants in both locations are awake.
24-Hour Schedule Conversion Matrix
Compare every hour of the day between JST and EST.
| JST Time (Japan Standard Time) | EST Time (Eastern Standard Time) | Status & Recommendation |
|---|---|---|
| 00:00AM | 11:00AM-1 day | ⚪ Outside Work Hours |
| 01:00AM | 12:00PM-1 day | ⚪ Outside Work Hours |
| 02:00AM | 13:00PM-1 day | ⚪ Outside Work Hours |
| 03:00AM | 14:00PM-1 day | ⚪ Outside Work Hours |
| 04:00AM | 15:00PM-1 day | ⚪ Outside Work Hours |
| 05:00AM | 16:00PM-1 day | ⚪ Outside Work Hours |
| 06:00AM | 17:00PM-1 day | ⚪ Outside Work Hours |
| 07:00AM | 18:00PM-1 day | ⚪ Outside Work Hours |
| 08:00AM | 19:00PM-1 day | ⚪ Outside Work Hours |
| 09:00AM | 20:00PM-1 day | 🟡 Feasible (Shoulder Hour) |
| 10:00AM | 21:00PM-1 day | ⚪ Outside Work Hours |
| 11:00AM | 22:00PM-1 day | ⚪ Outside Work Hours |
| 12:00PM | 23:00PM-1 day | ⚪ Outside Work Hours |
| 13:00PM | 00:00AM | ⚪ Outside Work Hours |
| 14:00PM | 01:00AM | ⚪ Outside Work Hours |
| 15:00PM | 02:00AM | ⚪ Outside Work Hours |
| 16:00PM | 03:00AM | ⚪ Outside Work Hours |
| 17:00PM | 04:00AM | ⚪ Outside Work Hours |
| 18:00PM | 05:00AM | ⚪ Outside Work Hours |
| 19:00PM | 06:00AM | ⚪ Outside Work Hours |
| 20:00PM | 07:00AM | ⚪ Outside Work Hours |
| 21:00PM | 08:00AM | ⚪ Outside Work Hours |
| 22:00PM | 09:00AM | ⚪ Outside Work Hours |
| 23:00PM | 10:00AM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between JST and EST?
EST is 13 hours behind JST. When it is 12:00 PM (noon) in JST, the current synchronized time in EST is 11:00 PM.
What are the overlapping working hours between JST and EST?
Due to the timezone separation, standard 9-to-5 working shifts do not overlap. The recommended compromise window falls during morning/evening shoulder periods (7:00 AM – 9:00 PM in JST = 6:00 PM – 8:00 AM in EST).
Does daylight saving time affect the conversion between JST and EST?
Yes. EST observes daylight saving shifts (EDT), shifting the offset difference by 1 hour between summer and winter while JST stays on fixed standard time year-round.
What regions and major cities observe JST and EST?
JST (Japan Standard Time) is primarily observed across East Asia (Japan) (key hubs include Tokyo, Osaka, Yokohama, Nagoya). EST (Eastern Standard Time) is observed across Eastern North America (US East Coast & Eastern Canada) (key hubs include New York, Toronto, Miami, Atlanta).
What is 9:00 AM JST in EST?
9:00 AM in JST corresponds to 8:00 PM in EST. You can cross-reference every hour of the day in the 24-hour visual schedule table above.
Which time zone is ahead, JST or EST?
JST is ahead by 13 hours.