JST to NST
-12h 30mJST
JSTSOURCENST
NSTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and NST on the World Map
The map below highlights the JST (Japan Standard Time) and NST (Newfoundland Standard 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.
NST – Newfoundland Standard Time
UTC-03:30Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.
- •NST is one of only a few half-hour offset time zones in the world.
- •Newfoundland joined Canada in 1949 and kept its unique time zone.
- •St. John's is the easternmost city in North America.
Time Conversion Guide: JST to NST
JST runs on Japan Standard Time (JST) at UTC+09:00. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts JST 12 hours 30 minutes behind NST — a difference of -12h 30m at the current offsets.
In practice, when it is 9:00 AM in JST it is 8:30 PM in NST on the previous day. Midnight in JST is 11:30 AM in NST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to NST time conversion table
| JST (JST) | NST (NST) | Day |
|---|---|---|
| 12:00 AM | 11:30 AM | previous day |
| 6:00 AM | 5:30 PM | previous day |
| 7:00 AM | 6:30 PM | previous day |
| 8:00 AM | 7:30 PM | previous day |
| 9:00 AM | 8:30 PM | previous day |
| 12:00 PM | 11:30 PM | previous day |
| 3:00 PM | 2:30 AM | same day |
| 5:00 PM | 4:30 AM | same day |
| 6:00 PM | 5:30 AM | same day |
| 9:00 PM | 8:30 AM | same day |
Why people convert JST to NST time
- Scheduling a call from JST to NST: a 10:00 AM start in JST lands at 9:30 PM in NST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -12h 30m gap: JST and NST 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 NST is 8:30 PM in JST.
- Watching a live event or market open: JST viewers need 8:30 PM in NST to catch a 9:00 AM start there, and 12:30 PM if the event is anchored to JST.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -12h 30m gap is not.
- With a -12h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week NST 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 NST (Newfoundland Standard Time)
Newfoundland Standard Time (NST) is one of the few half-hour offset time zones in the world. It covers the island of Newfoundland in Canada and is 30 minutes ahead of Atlantic Standard Time. This unique offset exists because Newfoundland was an independent country until 1949.
Best time to call between JST and NST
With a -12h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. NST opens at 9:00 AM NST, which is 8:30 PM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and NST have no shared working hours because of the -12h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 12 hours 30 minutes behind NST (JST UTC+09:00 → NST UTC-03:30). 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
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 NST?
JST (JST, UTC+09:00) is 12 hours 30 minutes behind NST (NST, UTC-03:30). The gap is currently -12h 30m.
How do I convert JST time to NST time?
Add -12h 30m to JST local time. For example, 9:00 AM in JST is 8:30 PM in NST (previous day).
What time is it in NST right now?
NST uses NST at UTC-03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -12h 30m offset from JST.
What is the best time to call NST from JST?
There is no shared working-hours window because of the -12h 30m gap. The closest option is 1:00 PM in JST, which is 12:30 AM in NST.
Which is behind, JST or NST?
JST is 12 hours 30 minutes behind NST. When it is 12:00 PM in JST it is 11:30 PM in NST.
Does daylight saving time affect the JST–NST difference?
Neither zone observes daylight saving time, so the -12h 30m offset between JST and NST 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 NST?
Sometimes. The -12h 30m gap is large enough that 8:00 PM or later in JST already falls on the in NST.
What is the time difference between JST and NST?
NST is -12h 30m from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is NST in?
NST 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 NST timezone?
Major cities in the NST timezone include St. John's, Corner Brook, Mount Pearl.
What is the UTC offset for NST?
Newfoundland Standard Time (NST) is at UTC-03:30. During daylight saving time, it shifts to NDT.
What should I know about the NST timezone?
NST is one of only a few half-hour offset time zones in the world. Newfoundland joined Canada in 1949 and kept its unique time zone.
When is it midnight in JST, what time is it in NST?
When it is 12:00 AM (midnight) in JST (JST), it is -12h 30m later in NST (NST).
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