JST to EDT
-13hJST
JSTSOURCEEDT
EDTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and EDT on the World Map
The map below highlights the JST (Japan Standard Time) and EDT (Eastern Daylight Time) timezone regions across the globe.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
EDT – Eastern Daylight Time
UTC-04:00Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.
- •EDT is observed from the second Sunday of March to the first Sunday of November.
- •During EDT, the US East Coast is only 4 hours behind London (instead of 5).
- •Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.
Time Conversion Guide: JST to EDT
JST runs on Japan Standard Time (JST) at UTC+09:00. EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. That puts JST 13 hours behind EDT — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in JST it is 8:00 PM in EDT on the previous day. Midnight in JST is 11:00 AM in EDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to EDT time conversion table
| JST (JST) | EDT (EDT) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | previous day |
| 6:00 AM | 5:00 PM | previous day |
| 7:00 AM | 6:00 PM | previous day |
| 8:00 AM | 7:00 PM | previous day |
| 9:00 AM | 8:00 PM | previous day |
| 12:00 PM | 11:00 PM | previous day |
| 3:00 PM | 2:00 AM | same day |
| 5:00 PM | 4:00 AM | same day |
| 6:00 PM | 5:00 AM | same day |
| 9:00 PM | 8:00 AM | same day |
Why people convert JST to EDT time
- Scheduling a call from JST to EDT: a 10:00 AM start in JST lands at 9:00 PM in EDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: JST and EDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in EDT is 8:00 PM in JST.
- Booking travel or deliveries: tracking EDT local time against JST keeps pickup windows and arrival estimates honest across the -13h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -13h gap is not.
- With a -13h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week EDT does.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
About EDT (Eastern Daylight Time)
Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.
Best time to call between JST and EDT
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. EDT opens at 9:00 AM EDT, which is 8:00 PM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and EDT have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 13 hours behind EDT (JST UTC+09:00 → EDT UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
JST
Does not observe DST
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between JST and EDT?
JST (JST, UTC+09:00) is 13 hours behind EDT (EDT, UTC-04:00). The gap is currently -13h.
How do I convert JST time to EDT time?
Add -13h to JST local time. For example, 9:00 AM in JST is 8:00 PM in EDT (previous day).
What time is it in EDT right now?
EDT uses EDT at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -13h offset from JST.
What is the best time to call EDT from JST?
There is no shared working-hours window because of the -13h gap. The closest option is 1:00 PM in JST, which is 12:00 AM in EDT.
Which is behind, JST or EDT?
JST is 13 hours behind EDT. When it is 12:00 PM in JST it is 11:00 PM in EDT.
Does daylight saving time affect the JST–EDT difference?
Neither zone observes daylight saving time, so the -13h offset between JST and EDT is fixed all year.
Which other cities share JST's time zone?
JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.
Which countries use JST, JST's zone?
JST is used in Japan.
Is there a day difference between JST and EDT?
Sometimes. The -13h gap is large enough that 8:00 PM or later in JST already falls on the in EDT.
What is the time difference between JST and EDT?
EDT is -13h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is EDT in?
EDT operates on its local timezone.
Which countries use JST (Japan Standard Time)?
JST is used in Japan.
Does JST observe daylight saving time?
No, JST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about JST?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
Which cities are in the EDT timezone?
Major cities in the EDT timezone include New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
What is the UTC offset for EDT?
Eastern Daylight Time (EDT) is at UTC-04:00. During daylight saving time, it shifts to EST.
What should I know about the EDT timezone?
EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).
When is it midnight in JST, what time is it in EDT?
When it is 12:00 AM (midnight) in JST (JST), it is -13h later in EDT (EDT).
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See every conversion from JST →·See every conversion from EDT →