JST to EDT Converter
Convert time between Japan Standard Time (JST) and Eastern Daylight Time (EDT)
Japan Standard Time (JST)
Eastern Daylight Time (EDT)
Time Difference
Eastern Daylight Time (EDT) is 0 hours ahead of Japan Standard Time (JST)
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Select Time
Quick Reference
| JST | EDT |
|---|---|
| 11:00 | 21:00 |
| 13:00 | 23:00 |
| 15:00 | 01:00 |
| 17:00 | 03:00 |
| 19:00 | 05:00 |
| 21:00 | 07:00 |
| 23:00 | 09:00 |
| 01:00 | 11:00 |
| 03:00 | 13:00 |
| 05:00 | 15:00 |
| 07:00 | 17:00 |
| 09:00 | 19:00 |
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 JST to EDT Time Conversion
Converting time between Japan Standard Time (JST) and Eastern Daylight Time (EDT) is essential for Japan to US Eastern region coordination during daylight saving season. JST is UTC+9 while EDT is UTC-4, making JST 13 hours ahead of EDT. Japan does not observe daylight saving time, so JST remains constant year-round. The US Eastern region observes daylight saving time from mid-March to early November, using EDT (UTC-4). From November to mid-March, the region uses EST (UTC-5), which increases the difference to 14 hours.
This conversion is crucial for business operations between Japan and major US Eastern cities. Whether you're scheduling international meetings, coordinating between Tokyo and New York, 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 JST to EDT Conversion
Business & Work
- Scheduling Japan to US Eastern region business meetings during daylight saving season
- Coordinating Tokyo and New York corporate operations
- Managing global business operations between Japan and Eastern USA during spring and summer
Personal & Travel
- Planning travel from Japan to US Eastern region during daylight saving months
- Coordinating with Eastern region family and friends from Japan
- Scheduling virtual events for Japan-Eastern USA audiences during daylight saving
Time Zone Information
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
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
Quick Reference: JST to EDT
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 JST and EDT?
Japan Standard Time (JST) is UTC+9, while Eastern Daylight Time (EDT) is UTC-4. JST is 13 hours ahead of EDT. This means when it's 6:00 AM JST, it's 5:00 PM EDT the previous day.
How does the JST to EDT offset differ from JST to EST?
Eastern Daylight Time (EDT) is UTC-4 and is 1 hour ahead of Eastern Standard Time (EST) which is UTC-5. Since JST is 14 hours ahead of EST, it's 13 hours ahead of EDT. The Eastern region uses EDT from mid-March to early November during daylight saving time.
Does Japan observe daylight saving time like EDT does?
No, Japan does not observe daylight saving time. Japan Standard Time (JST) remains UTC+9 year-round. The US Eastern region observes 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 with Japan varies between 13 hours (EDT period) and 14 hours (EST period).
What major cities are in JST and EDT timezones?
JST covers all major Japanese cities including Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka, and Kobe. EDT covers major Eastern US cities like New York, Boston, Philadelphia, Washington DC, and Atlanta during daylight saving season (March-November).
How do I convert JST to EDT manually?
To convert from JST to EDT, subtract 13 hours from the JST time. For example, if it's 3:00 PM (15:00) JST, subtract 13 hours to get 2:00 AM EDT the same day. Remember that when EDT ends and EST begins (early November), subtract 14 hours instead of 13.
What should I know about scheduling across JST and EDT?
Japan is 13 hours ahead of the Eastern US during daylight saving season, with limited business hour overlap. Morning JST (8-10 AM) corresponds to evening EDT (7-9 PM previous day), while late afternoon JST (4-6 PM) aligns with morning EDT (3-5 AM). Evening JST (7-9 PM) offers good overlap with late morning EDT (6-8 AM). Schedule important meetings during the evening JST / early morning EDT window for best results.
Pro Tips
- • JST is always 13 hours ahead of EDT during daylight saving season (March-November).
- • Japan does not observe daylight saving time, so JST is consistent while EDT transitions to EST.
- • Evening JST (7-9 PM) equals early morning EDT (6-8 AM), providing the best overlap for real-time communication.
- • Morning JST (8-10 AM) equals evening EDT (7-9 PM previous day), making those times suitable for business coordination.
- • When the 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.