Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

NST to JST

+12h 30m

NST

NSTSOURCE

UTC-02:30☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

JST

UTC+09:00

HH12

MM30

(next day)00:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

NST

JST

12:00 AM

11:30 AM

2:00 AM

1:30 PM

4:00 AM

3:30 PM

6:00 AM

5:30 PM

8:00 AM

7:30 PM

10:00 AM

9:30 PM

12:00 PM

11:30 PM

2:00 PM

1:30 AM+1

4:00 PM

3:30 AM+1

6:00 PM

5:30 AM+1

8:00 PM

7:30 AM+1

10:00 PM

9:30 AM+1

Green 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 Zone

→

JST Zone

Explore all world timezones interactively →

NST – Newfoundland Standard Time

UTC-03:30

Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.

Countries in NST

Canada (Newfoundland)

Major Cities in NST

St. John'sCorner BrookMount Pearl

Key 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.
•St. John's is the easternmost city in North America.

Daylight Saving:Yes – switches to NDT

Learn more about NST on Wikipedia

JST – Japan Standard Time

UTC+09:00

Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.

Countries in JST

Japan

Major Cities in JST

TokyoOsakaYokohamaNagoyaSapporoKyotoKobeFukuokaHiroshima

Key Facts about JST

•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.

Daylight Saving:No – UTC+09:00 year-round

Learn more about JST on Wikipedia

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

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.