NST to Tehran
+7hNST
NSTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
NST and IRST on the World Map
The map below highlights the NST (Newfoundland Standard Time) and IRST (Iran 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.
IRST – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •IRST is one of only a few time zones with a 30-minute offset.
- •Iran observes daylight saving time, switching to IRDT (UTC+04:30).
- •Tehran has a metropolitan population of over 16 million.
About Tehran
WikipediaTehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
NST to Tehran Time Difference – Complete Guide
NST runs on Newfoundland Standard Time (NST) at UTC-03:30. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts NST 7 hours ahead of Tehran — a difference of +7h at the current offsets.
In practice, when it is 9:00 AM in NST it is 4:00 PM in Tehran. Midnight in NST is 7:00 AM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
NST to Tehran time conversion table
| NST (NST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | same day |
| 6:00 AM | 1:00 PM | same day |
| 7:00 AM | 2:00 PM | same day |
| 8:00 AM | 3:00 PM | same day |
| 9:00 AM | 4:00 PM | same day |
| 12:00 PM | 7:00 PM | same day |
| 3:00 PM | 10:00 PM | same day |
| 5:00 PM | 12:00 AM | next day |
| 6:00 PM | 1:00 AM | next day |
| 9:00 PM | 4:00 AM | next day |
Why people convert NST to Tehran time
- Scheduling a call from NST to Tehran: a 10:00 AM start in NST lands at 5:00 PM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both NST and Tehran are inside the 9-to-5 working day between 9:00 AM and 10:00 AM NST time (4:00 PM–5:00 PM IRST). That is roughly 1 hours of usable overlap.
- Watching a live event or market open: NST viewers need 4:00 PM in Tehran to catch a 9:00 AM start there, and 5:00 PM if the event is anchored to NST.
- Always state the zone abbreviation, not just the hour. "3:00 PM NST" is unambiguous; "3 PM" across a +7h gap is not.
- Block 9:00 AM–10:00 AM NST as the recurring meeting window if you work primarily from NST and need Tehran colleagues present.
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 IRST (Iran Standard Time)
Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.
Best time to call between NST and Tehran
Both NST and Tehran sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM NST, which is 4:00 PM–5:00 PM IRST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
NST and Tehran overlap for only 60 minutes (9:00 AM–10:00 AM NST), so meetings have to be booked precisely.
NST is 7 hours ahead of Tehran (NST UTC-03:30 → IRST UTC+03:30). The shared working window is 9:00 AM–10:00 AM NST. 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
Tehran
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 Tehran?
NST (NST, UTC-03:30) is 7 hours ahead of Tehran (IRST, UTC+03:30). The gap is currently +7h.
How do I convert NST time to Tehran time?
Add +7h to NST local time. For example, 9:00 AM in NST is 4:00 PM in Tehran.
What time is it in Tehran right now?
Tehran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from NST.
What is the best time to call Tehran from NST?
Call between 9:00 AM and 10:00 AM NST — that maps to 4:00 PM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, NST or Tehran?
NST is 7 hours ahead of Tehran. When it is 12:00 PM in NST it is 7:00 PM in Tehran.
Do NST and Tehran use different time zones?
NST uses NST at UTC-03:30, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are America/St_Johns and Asia/Tehran.
Does daylight saving time affect the NST–Tehran difference?
Neither zone observes daylight saving time, so the +7h offset between NST and Tehran 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 Tehran?
Not normally. The +7h gap only pushes the date over for late-evening times.
What is the time difference between NST and Tehran?
Tehran is +7h from NST.
What timezone is NST in?
NST operates on its local timezone.
What timezone is Tehran in?
Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
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 IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).
When is it midnight in NST, what time is it in Tehran?
When it is 12:00 AM (midnight) in NST (NST), it is +7h later in Tehran (IRST).
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