NST to JST
+12h 30mNST
NSTSOURCEJST
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
NST and JST on the World Map
The map below highlights the NST (Newfoundland Standard Time) and JST (Japan Standard Time) timezone regions across the globe.
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.
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.
Understanding the +12h 30m Gap: NST vs JST
NST runs on Newfoundland Standard Time (NST) at UTC-03:30. JST runs on Japan Standard Time (JST) at UTC+09:00. That puts NST 12 hours 30 minutes ahead of JST — a difference of +12h 30m at the current offsets.
In practice, when it is 9:00 AM in NST it is 9:30 PM in JST. Midnight in NST is 12:30 PM in JST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
NST to JST time conversion table
| NST (NST) | JST (JST) | Day |
|---|---|---|
| 12:00 AM | 12:30 PM | same day |
| 6:00 AM | 6:30 PM | same day |
| 7:00 AM | 7:30 PM | same day |
| 8:00 AM | 8:30 PM | same day |
| 9:00 AM | 9:30 PM | same day |
| 12:00 PM | 12:30 AM | next day |
| 3:00 PM | 3:30 AM | next day |
| 5:00 PM | 5:30 AM | next day |
| 6:00 PM | 6:30 AM | next day |
| 9:00 PM | 9:30 AM | next day |
Why people convert NST to JST time
- Scheduling a call from NST to JST: a 10:00 AM start in NST lands at 10:30 PM in JST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +12h 30m gap: NST and JST 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 JST is 9:30 PM in NST.
- Booking travel or deliveries: tracking JST local time against NST keeps pickup windows and arrival estimates honest across the +12h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM NST" 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 NST takes the early slot, the next week JST does.
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.
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.
Best time to call between NST and JST
With a +12h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. JST opens at 9:00 AM JST, which is 9:30 PM in NST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
NST and JST have no shared working hours because of the +12h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
NST is 12 hours 30 minutes ahead of JST (NST UTC-03:30 → JST UTC+09:00). 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
Clocks fall back on Sun, Nov 1, 2026
JST
Does not observe DST
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 NST and JST?
NST (NST, UTC-03:30) is 12 hours 30 minutes ahead of JST (JST, UTC+09:00). The gap is currently +12h 30m.
How do I convert NST time to JST time?
Add +12h 30m to NST local time. For example, 9:00 AM in NST is 9:30 PM in JST.
What time is it in JST right now?
JST uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +12h 30m offset from NST.
What is the best time to call JST from NST?
There is no shared working-hours window because of the +12h 30m gap. The closest option is 1:00 PM in NST, which is 1:30 AM in JST.
Which is ahead, NST or JST?
NST is 12 hours 30 minutes ahead of JST. When it is 12:00 PM in NST it is 12:30 AM in JST.
Does daylight saving time affect the NST–JST difference?
Neither zone observes daylight saving time, so the +12h 30m offset between NST and JST is fixed all year.
Which other cities share NST's time zone?
NST also covers St. John's, Corner Brook, Mount Pearl.
Which countries use NST, NST's zone?
NST is used in Canada (Newfoundland).
Is there a day difference between NST and JST?
Sometimes. The +12h 30m gap is large enough that 8:00 PM or later in NST already falls on the next day in JST.
What is the time difference between NST and JST?
JST is +12h 30m from NST.
What timezone is NST in?
NST operates on its local timezone.
What timezone is JST in?
JST operates on its local timezone.
Which countries use NST (Newfoundland Standard Time)?
NST is used in Canada (Newfoundland).
Does NST observe daylight saving time?
Yes, NST switches to NDT during summer months.
What are some interesting facts about NST?
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.
Which cities are in the JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in NST, what time is it in JST?
When it is 12:00 AM (midnight) in NST (NST), it is +12h 30m later in JST (JST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More NST time conversions
- nst to new york
- nst to london
- nst to dubai
- nst to tokyo
- nst to singapore
- nst to sydney
- nst to los angeles
- nst to paris
- nst to delhi
- nst to mumbai
- nst to berlin
- nst to hong kong
- nst to toronto
- nst to kathmandu
- new york to nst
- london to nst
- dubai to nst
- tokyo to nst
- singapore to nst
- sydney to nst
- los angeles to nst
- paris to nst
- delhi to nst
- mumbai to nst
- berlin to nst
- hong kong to nst
- toronto to nst
- kathmandu to nst
See every conversion from NST →·See every conversion from JST →