EDT to JST Converter
Convert time between Eastern Daylight Time (EDT) and Japan Standard Time (JST)
Eastern Daylight Time (EDT)
Japan Standard Time (JST)
Time Difference
Japan Standard Time (JST) is 0 hours ahead of Eastern Daylight Time (EDT)
Select Date
Select Time
Quick Reference
| EDT | JST |
|---|---|
| 21:00 | 11:00 |
| 23:00 | 13:00 |
| 01:00 | 15:00 |
| 03:00 | 17:00 |
| 05:00 | 19:00 |
| 07:00 | 21:00 |
| 09:00 | 23:00 |
| 11:00 | 01:00 |
| 13:00 | 03:00 |
| 15:00 | 05:00 |
| 17:00 | 07:00 |
| 19:00 | 09:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About EDT to JST Time Conversion
Converting time from Eastern Daylight Time (EDT) to Japan Standard Time (JST) is essential for US Eastern region to Japan coordination during daylight saving season. EDT is UTC-4 while JST is UTC+9, making JST 13 hours ahead of EDT. The US Eastern region observes daylight saving time from mid-March to early November (using EDT). From November to mid-March, it uses EST (UTC-5), which increases the difference to 14 hours. Japan does not observe daylight saving time, so JST remains constant at UTC+9 year-round.
This conversion is crucial for business operations between the US Eastern region and Japan during daylight saving months. Whether you're scheduling international meetings, coordinating between New York and Tokyo, managing customer service operations, or coordinating with business partners across both regions, our accurate IANA-based converter ensures precise timezone calculations.
Common Use Cases for EDT to JST Conversion
Business & Work
- Scheduling US Eastern region to Japan business meetings during daylight saving season
- Coordinating New York and Tokyo corporate operations
- Managing global business operations between Eastern USA and Japan during spring and summer
Personal & Travel
- Planning travel from US Eastern region to Japan during daylight saving months
- Coordinating with Japan family and friends from Eastern USA
- Scheduling virtual events for Eastern USA-Japan audiences during daylight saving
Time Zone Information
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Boston, Philadelphia, Washington DC, Atlanta
- Coverage: US Eastern region during daylight saving
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - JST is standard time year-round
- Major Cities: Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka
- Coverage: All of Japan
Quick Reference: EDT to JST
Remember: JST is always 13 hours ahead of EDT during daylight saving season (March-November). When EDT ends and EST begins, the difference becomes 14 hours.
Frequently Asked Questions
What is the time difference between EDT and JST?
Eastern Daylight Time (EDT) is UTC-4, while Japan Standard Time (JST) is UTC+9. JST is 13 hours ahead of EDT, meaning EDT is 13 hours behind JST. When it's 5:00 PM EDT, it's 6:00 AM JST the next day.
How does the EDT to JST offset differ from EST to JST?
Eastern Standard Time (EST) is UTC-5 used during winter, while Eastern Daylight Time (EDT) is UTC-4 used during summer daylight saving. Since JST is 13 hours ahead of EDT, it's 14 hours ahead of EST. Eastern US cities transition from EDT to EST in early November and back to EDT in mid-March.
Does the Eastern US observe daylight saving time like JST does?
No, Japan does not observe daylight saving time. The Eastern US does observe daylight saving time, using EDT (UTC-4) from mid-March to early November and EST (UTC-5) from November to mid-March. This means the time difference between the Eastern US and Japan varies between 13 hours (EDT period) and 14 hours (EST period).
What major cities are in EDT and JST timezones?
EDT covers major Eastern US cities including New York, Boston, Philadelphia, Washington DC, and Atlanta during daylight saving season (March-November). JST covers all major Japanese cities including Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka, and Kobe year-round.
How do I convert EDT to JST manually?
To convert from EDT to JST, add 13 hours to the EDT time. For example, if it's 2:00 AM EDT, add 13 hours to get 3:00 PM (15:00) JST the same day. Remember that when EDT transitions to EST (early November), you'll add 14 hours instead of 13.
What should I know about scheduling across EDT and JST?
Eastern US is 13 hours behind Japan during daylight saving season. Morning EDT (8-10 AM) corresponds to late night/early morning JST (9-11 PM), while late morning EDT (10 AM-12 PM) aligns with night-time JST (11 PM-1 AM next day). Late afternoon EDT (4-6 PM) reaches morning JST (5-7 AM next day), providing good overlap. Evening EDT (6-9 PM) offers mid-morning JST (7-10 AM next day) for the best real-time communication window.
Pro Tips
- • EDT is always 13 hours behind JST during the daylight saving period (March-November).
- • Japan does not observe daylight saving time, so JST is consistent while EDT transitions to EST.
- • Evening EDT (6-9 PM) equals morning JST (7-10 AM next day), providing the best overlap for real-time communication.
- • Morning EDT (8-10 AM) equals late night JST (9-11 PM), making it less suitable for business coordination.
- • When Eastern US transitions from EDT to EST (early November), the time difference increases from 13 to 14 hours.
- • Use the converter during daylight saving transitions to ensure accurate scheduling when EDT changes to EST.