EST to JST Converter
Understanding EST and JST Time Zones
Eastern Standard Time (EST)
Eastern Standard Time is observed in undefined and uses the offset UTC-5. Major cities in this time zone include New York, Washington DC, Miami, Atlanta, Boston. This time zone serves a significant global region with important economic and cultural hubs.
Japan Standard Time (JST)
Japan Standard Time operates at UTC+9, covering undefined. Key cities include Tokyo, Osaka, Yokohama. The 14-hour forward offset from EST means that when professionals in New York start their workday at 9:00 AM, it is already 11:00 PM in Tokyo.
EST is also commonly referred to as Eastern Time, ET, East Coast time, New York time. JST is also known as Japan time, Tokyo time, Japanese time. So if you are searching for Eastern Time to Japan time, this is the same conversion as EST to JST.
Complete EST to JST Conversion Table
The table below shows every two-hour increment converted from Eastern Standard Time to Japan Standard Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.
| EST (Eastern Standard Time) | JST (Japan Standard Time) |
|---|---|
| 12:00 AM (00:00) | 2:00 PM (14:00) |
| 2:00 AM (02:00) | 4:00 PM (16:00) |
| 4:00 AM (04:00) | 6:00 PM (18:00) |
| 6:00 AM (06:00) | 8:00 PM (20:00) |
| 8:00 AM (08:00) | 10:00 PM (22:00) |
| 10:00 AM (10:00) | 12:00 AM (00:00) (next day) |
| 12:00 PM (12:00) | 2:00 AM (02:00) (next day) |
| 2:00 PM (14:00) | 4:00 AM (04:00) (next day) |
| 4:00 PM (16:00) | 6:00 AM (06:00) (next day) |
| 6:00 PM (18:00) | 8:00 AM (08:00) (next day) |
| 8:00 PM (20:00) | 10:00 AM (10:00) (next day) |
| 10:00 PM (22:00) | 12:00 PM (12:00) (next day) |
Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.
Scheduling Between EST and JST
For business scheduling, the optimal overlap window between EST and JST falls roughly between 7:00 PM and 3:00 AM EST. This ensures both New York and Tokyo teams are within standard working hours.
The large 14-hour gap between EST and JST means that finding overlapping working hours requires compromise from at least one side. Consider adopting asynchronous workflows — recorded video updates, shared documents, and time-zone-aware project management tools — to supplement the limited real-time overlap.
Travel Between New York and Tokyo
Travelers flying from New York to Tokyo should adjust their sleep schedule 14 days before departure at a rate of one hour per day. For this significant time difference, gradual adjustment reduces jet lag dramatically.
Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 14-hour shift between EST and JST, plan for roughly one week of gradual adjustment for optimal performance.
Daylight Saving Time Considerations
During standard time months (November through March in the US), this offset is fixed. However, if either zone observes daylight saving time, the difference may temporarily shift by one hour during transition weeks in spring and autumn.
For the EST to JST conversion specifically: EST (UTC-5) observes DST, while JST (UTC+9) does not observe DST. This means the offset between them changes by one hour seasonally — the usual 14-hour gap becomes 13 or 15 hours during DST transitions.
Related Time Zone Conversions
References & Resources
Frequently Asked Questions
EST (Eastern Standard Time) is 14 hours behind JST (Japan Standard Time). EST is UTC-5 and JST is UTC+9.
When it is 12:00 PM (noon) in EST, it is 2:00 AM (next day) in JST.
The best overlap for business hours is approximately 11:00 PM to 7:00 AM JST, which corresponds to 9:00 AM to 5:00 PM in EST. Given the large gap, consider alternating between early and late meeting times.
During standard time months (November through March in the US), this offset is fixed. However, if either zone observes daylight saving time, the difference may temporarily shift by one hour during transition weeks in spring and autumn.