Convert Japan Standard Time to Eastern Daylight Time (JST to EDT)

Understanding JST and EDT Time Zones

Japan Standard Time (JST)

Japan Standard Time is observed in undefined and uses the offset UTC+9. Major cities in this time zone include Tokyo, Osaka, Yokohama. This time zone serves a significant global region with important economic and cultural hubs.

Eastern Daylight Time (EDT)

Eastern Daylight Time operates at UTC-4, covering undefined. Key cities include New York, Washington DC, Miami, Atlanta, Boston. The 13-hour backward offset from JST means that when professionals in Tokyo start their workday at 9:00 AM, it is already 8:00 PM in New York.

JST is also commonly referred to as Japan time, Tokyo time, Japanese time. EDT is also known as Eastern Daylight, Eastern Time, ET, East Coast time, New York time. So if you are searching for Japan time to Eastern Daylight, this is the same conversion as JST to EDT.

Complete JST to EDT Conversion Table

The table below shows every two-hour increment converted from Japan Standard Time to Eastern Daylight Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.

Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.

Scheduling Between JST and EDT

When coordinating deliverables across JST and EDT, set deadlines in the earlier time zone to avoid end-of-day confusion. A "5 PM deadline" should specify which zone to prevent missed deliveries due to the 13-hour offset.

The large 13-hour gap between JST and EDT 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 Tokyo and New York

Flight times between Tokyo and New York often appear misleading because of the time zone shift. A departure at 10:00 AM JST arriving at 9:00 AM EDT may look long, but remember to factor in the 13-hour offset.

Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 13-hour shift between JST and EDT, plan for roughly one week of gradual adjustment for optimal performance.

Daylight Saving Time Considerations

Countries near the equator — including Singapore, most of Africa, and parts of South America — do not observe DST, making their offsets constant year-round. This simplifies scheduling compared to US or European zones.

For the JST to EDT conversion specifically: JST (UTC+9) does not observe DST, while EDT (UTC-4) does observe DST. This means the offset between them changes by one hour seasonally — the usual 13-hour gap becomes 12 or 14 hours during DST transitions.

Related Time Zone Conversions

References & Resources

• TimeAndDate.com — World Time Zones
• NIST — Official US Time Standard
• IANA Time Zone Database
• Wikipedia — Time Zone Abbreviations
• WorldTimeServer — Current Times Worldwide
• NICT — Official Japanese Time

Frequently Asked Questions