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

Understanding EDT and JST Time Zones

Eastern Daylight Time (EDT)

Eastern Daylight Time is observed in undefined and uses the offset UTC-4. 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 13-hour forward offset from EDT means that when professionals in New York start their workday at 9:00 AM, it is already 10:00 PM in Tokyo.

EDT is also commonly referred to as Eastern Daylight, 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 Daylight to Japan time, this is the same conversion as EDT to JST.

Complete EDT to JST Conversion Table

The table below shows every two-hour increment converted from Eastern Daylight Time to Japan Standard 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 EDT and JST

International conference calls between New York, Washington DC, Miami, Atlanta, Boston and Tokyo, Osaka, Yokohama work best when scheduled during the overlap of both regions' business hours. Rotating meeting times monthly ensures fairness across time zones.

The large 13-hour gap between EDT 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

Booking hotels and transportation in Tokyo? Double-check whether listed check-in times are in JST (local) or your departure time zone. A common mistake is arriving 13 hours early or late due to unconverted times.

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

Daylight Saving Time Considerations

When daylight saving time is in effect, the abbreviation changes (e.g., EST becomes EDT, CET becomes CEST). Our converter handles this automatically, but being aware of which version is active helps avoid confusion.

For the EDT to JST conversion specifically: EDT (UTC-4) observes DST, while JST (UTC+9) does not 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