Johannesburg to Tehran
+1h 30mJohannesburg
SASTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
SAST and IRST on the World Map
The map below highlights the SAST (South Africa Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
SAST – South Africa Standard Time
UTC+02:00South Africa Standard Time (SAST) is the time zone for South Africa and neighboring countries, 2 hours ahead of UTC.
- •South Africa does not observe daylight saving time.
- •SAST is the same offset as EET and Israel Standard Time.
- •The Johannesburg Stock Exchange (JSE) is Africa's largest.
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 Johannesburg
WikipediaJohannesburg operates on South Africa Time (SAST), UTC+2. As Africa's largest economy hub and home to the JSE, Johannesburg drives African financial markets.
Johannesburg is built on the world's largest gold deposit.
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).
Understanding the +1h 30m Gap: Johannesburg vs Tehran
Johannesburg runs on South Africa Standard Time (SAST) at UTC+02:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Johannesburg 1 hour 30 minutes ahead of Tehran — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in Johannesburg it is 10:30 AM in Tehran. Midnight in Johannesburg is 1:30 AM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Johannesburg to Tehran time conversion table
| Johannesburg (SAST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 1:30 AM | same day |
| 6:00 AM | 7:30 AM | same day |
| 7:00 AM | 8:30 AM | same day |
| 8:00 AM | 9:30 AM | same day |
| 9:00 AM | 10:30 AM | same day |
| 12:00 PM | 1:30 PM | same day |
| 3:00 PM | 4:30 PM | same day |
| 5:00 PM | 6:30 PM | same day |
| 6:00 PM | 7:30 PM | same day |
| 9:00 PM | 10:30 PM | same day |
Why people convert Johannesburg to Tehran time
- Scheduling a call from Johannesburg to Tehran: a 10:00 AM start in Johannesburg lands at 11:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Johannesburg and Tehran are inside the 9-to-5 working day between 9:00 AM and 3:30 PM SAST time (10:30 AM–5:00 PM IRST). That is roughly 6 hours 30 minutes of usable overlap.
- Coordinating a Johannesburg-based team with Tehran contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM SAST" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM SAST as the recurring meeting window if you work primarily from Johannesburg and need Tehran colleagues present.
About SAST (South Africa Standard Time)
South Africa Standard Time (SAST) is used in South Africa, Lesotho, and Eswatini. SAST does not observe daylight saving time. Johannesburg and Cape Town are major economic hubs in Africa.
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 Johannesburg and Tehran
Both Johannesburg and Tehran sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM SAST, which is 10:30 AM–5:00 PM IRST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Johannesburg and Tehran share 6 hours of working-hours overlap (9:00 AM–3:30 PM SAST), so scheduling a live meeting is straightforward.
Johannesburg is 1 hour 30 minutes ahead of Tehran (SAST UTC+02:00 → IRST UTC+03:30). The shared working window is 9:00 AM–3:30 PM SAST. Remember to re-check around daylight-saving transitions.
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 Johannesburg and Tehran?
Johannesburg (SAST, UTC+02:00) is 1 hour 30 minutes ahead of Tehran (IRST, UTC+03:30). The gap is currently +1h 30m.
How do I convert Johannesburg time to Tehran time?
Add +1h 30m to Johannesburg local time. For example, 9:00 AM in Johannesburg is 10:30 AM 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 +1h 30m offset from Johannesburg.
What is the best time to call Tehran from Johannesburg?
Call between 9:00 AM and 3:30 PM SAST — that maps to 10:30 AM–5:00 PM IRST and keeps both parties inside the working day.
Which is ahead, Johannesburg or Tehran?
Johannesburg is 1 hour 30 minutes ahead of Tehran. When it is 12:00 PM in Johannesburg it is 1:30 PM in Tehran.
Do Johannesburg and Tehran use different time zones?
Johannesburg (South Africa) uses SAST at UTC+02:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Africa/Johannesburg and Asia/Tehran.
Does daylight saving time affect the Johannesburg–Tehran difference?
Neither zone observes daylight saving time, so the +1h 30m offset between Johannesburg and Tehran is fixed all year.
Which other cities share Johannesburg's time zone?
SAST also covers Johannesburg, Cape Town, Durban, Pretoria, Port Elizabeth.
Which countries use SAST, Johannesburg's zone?
SAST is used in South Africa, Lesotho, Eswatini.
Is there a day difference between Johannesburg and Tehran?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between Johannesburg and Tehran?
Tehran is +1h 30m from Johannesburg.
What timezone is Johannesburg in?
Johannesburg operates on South Africa Time (SAST), UTC+2. As Africa's largest economy hub and home to the JSE, Johannesburg drives African financial markets.
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 Johannesburg?
Standard business hours in Johannesburg are 8:00 AM - 5:00 PM SAST.
What are the business hours in Tehran?
Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.
What is the best time to schedule a call between Johannesburg and Tehran?
The best overlap for a call is when both cities are in business hours. Johannesburg works 8:00 AM - 5:00 PM SAST and Tehran works 8:00 AM - 4:00 PM IRST (+1h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Johannesburg and Tehran?
Johannesburg uses ZAR (R) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Johannesburg and Tehran compare in size?
Johannesburg has a population of approximately 5.8 million (metro: 10.5 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Johannesburg and Tehran?
Johannesburg is known for Apartheid Museum, Constitution Hill, Gold Reef City. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Johannesburg and Tehran have stock exchanges?
Yes. Johannesburg has the JSE (Johannesburg Stock Exchange) and Tehran has the TSE (Tehran Stock Exchange). The +1h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use SAST (South Africa Standard Time)?
SAST is used in South Africa, Lesotho, Eswatini.
Does SAST observe daylight saving time?
No, SAST does not observe daylight saving time and remains at UTC+02:00 year-round.
What are some interesting facts about SAST?
South Africa does not observe daylight saving time. SAST is the same offset as EET and Israel Standard Time.
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 Johannesburg, what time is it in Tehran?
When it is 12:00 AM (midnight) in Johannesburg (SAST), it is +1h 30m later in Tehran (IRST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Johannesburg time conversions
- johannesburg to sast
- johannesburg to south africa
- johannesburg to cairo
- johannesburg to lagos
- johannesburg to nairobi
- johannesburg to casablanca
- johannesburg to accra
- johannesburg to addis ababa
- johannesburg to new york
- johannesburg to london
- johannesburg to dubai
- johannesburg to tokyo
- johannesburg to singapore
- johannesburg to sydney
- johannesburg to los angeles
- johannesburg to paris
- johannesburg to delhi
- johannesburg to mumbai
- johannesburg to berlin
- johannesburg to hong kong
- johannesburg to toronto
- johannesburg to kathmandu
- new york to johannesburg
- london to johannesburg
- dubai to johannesburg
- tokyo to johannesburg
- singapore to johannesburg
- sydney to johannesburg
- los angeles to johannesburg
- paris to johannesburg
- delhi to johannesburg
- mumbai to johannesburg
- berlin to johannesburg
- hong kong to johannesburg
- toronto to johannesburg
- kathmandu to johannesburg
See every conversion from Johannesburg →·See every conversion from Tehran →