Shanghai to Tehran
-4h 30mShanghai
CSTSOURCETehran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
CST and IRST on the World Map
The map below highlights the CST (China Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
CST – China Standard Time
UTC+08:00China Standard Time (CST) covers all of mainland China, 8 hours ahead of UTC.
- •China uses a single time zone despite spanning 5 geographical zones.
- •In Xinjiang (western China), sunset can be as late as midnight in summer.
- •China abolished daylight saving time in 1991.
- •The Shanghai Stock Exchange operates on CST/Beijing Time.
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 Shanghai
WikipediaShanghai operates on China Standard Time (CST), UTC+8. As China's economic powerhouse and home to the SSE, Shanghai time is essential for global investors.
The Maglev train from Shanghai airport reaches 431 km/h, the fastest commercial train in the world.
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).
Comparing Time Zones: Shanghai and Tehran
Shanghai runs on China Standard Time (CST) at UTC+08:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Shanghai 4 hours 30 minutes behind Tehran — a difference of -4h 30m at the current offsets.
In practice, when it is 9:00 AM in Shanghai it is 4:30 AM in Tehran. Midnight in Shanghai is 7:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Shanghai to Tehran time conversion table
| Shanghai (CST) | Tehran (IRST) | Day |
|---|---|---|
| 12:00 AM | 7:30 PM | previous day |
| 6:00 AM | 1:30 AM | same day |
| 7:00 AM | 2:30 AM | same day |
| 8:00 AM | 3:30 AM | same day |
| 9:00 AM | 4:30 AM | same day |
| 12:00 PM | 7:30 AM | same day |
| 3:00 PM | 10:30 AM | same day |
| 5:00 PM | 12:30 PM | same day |
| 6:00 PM | 1:30 PM | same day |
| 9:00 PM | 4:30 PM | same day |
Why people convert Shanghai to Tehran time
- Scheduling a call from Shanghai to Tehran: a 10:00 AM start in Shanghai lands at 5:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Shanghai and Tehran are inside the 9-to-5 working day between 1:30 PM and 5:00 PM CST time (9:00 AM–12:30 PM IRST). That is roughly 3 hours 30 minutes of usable overlap.
- Watching a live event or market open: Shanghai viewers need 4:30 AM in Tehran to catch a 9:00 AM start there, and 4:30 AM if the event is anchored to Shanghai.
- Always state the zone abbreviation, not just the hour. "3:00 PM CST" is unambiguous; "3 PM" across a -4h 30m gap is not.
- Block 1:30 PM–5:00 PM CST as the recurring meeting window if you work primarily from Shanghai and need Tehran colleagues present.
About CST (China Standard Time)
China Standard Time (CST, also known as Beijing Time) is used across all of mainland China despite the country spanning five geographical time zones. This single-timezone policy was adopted in 1949. China does not observe daylight saving time. CST is shared with Hong Kong (HKT), Macau, Taiwan, Singapore, Malaysia, and the Philippines, making UTC+08:00 one of the most used offsets in the world.
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 Shanghai and Tehran
Both Shanghai and Tehran sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM CST, which is 9:00 AM–12:30 PM IRST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Shanghai and Tehran overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
Shanghai is 4 hours 30 minutes behind Tehran (CST UTC+08:00 → IRST UTC+03:30). The shared working window is 1:30 PM–5:00 PM CST. 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 Shanghai and Tehran?
Shanghai (CST, UTC+08:00) is 4 hours 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -4h 30m.
How do I convert Shanghai time to Tehran time?
Add -4h 30m to Shanghai local time. For example, 9:00 AM in Shanghai is 4:30 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 -4h 30m offset from Shanghai.
What is the best time to call Tehran from Shanghai?
Call between 1:30 PM and 5:00 PM CST — that maps to 9:00 AM–12:30 PM IRST and keeps both parties inside the working day.
Which is behind, Shanghai or Tehran?
Shanghai is 4 hours 30 minutes behind Tehran. When it is 12:00 PM in Shanghai it is 7:30 AM in Tehran.
Do Shanghai and Tehran use different time zones?
Shanghai (China) uses CST at UTC+08:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Shanghai and Asia/Tehran.
Does daylight saving time affect the Shanghai–Tehran difference?
Neither zone observes daylight saving time, so the -4h 30m offset between Shanghai and Tehran is fixed all year.
Which other cities share Shanghai's time zone?
CST also covers Shanghai, Beijing, Shenzhen, Guangzhou, Chengdu, Hong Kong, Taipei, Wuhan and 2 more.
Which countries use CST, Shanghai's zone?
CST is used in China, Hong Kong, Macau, Taiwan.
Is there a day difference between Shanghai and Tehran?
Not normally. The -4h 30m gap only pushes the date over the previous day.
What is the time difference between Shanghai and Tehran?
Tehran is -4h 30m from Shanghai.
What timezone is Shanghai in?
Shanghai operates on China Standard Time (CST), UTC+8. As China's economic powerhouse and home to the SSE, Shanghai time is essential for global investors.
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 Shanghai?
Standard business hours in Shanghai are 9:00 AM - 6:00 PM CST.
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 Shanghai and Tehran?
The best overlap for a call is when both cities are in business hours. Shanghai works 9:00 AM - 6:00 PM CST and Tehran works 8:00 AM - 4:00 PM IRST (-4h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Shanghai and Tehran?
Shanghai uses CNY (¥) while Tehran uses IRR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Shanghai and Tehran compare in size?
Shanghai has a population of approximately 24.9 million (metro: 28.5 million), while Tehran has approximately 9.4 million (metro: 16.8 million).
What are the major landmarks in Shanghai and Tehran?
Shanghai is known for The Bund, Oriental Pearl Tower, Yu Garden. Tehran is famous for Azadi Tower, Golestan Palace, Grand Bazaar.
Do Shanghai and Tehran have stock exchanges?
Yes. Shanghai has the SSE (Shanghai Stock Exchange) and Tehran has the TSE (Tehran Stock Exchange). The -4h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use CST (China Standard Time)?
CST is used in China, Hong Kong, Macau, Taiwan.
Does CST observe daylight saving time?
No, CST does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about CST?
China uses a single time zone despite spanning 5 geographical zones. In Xinjiang (western China), sunset can be as late as midnight in summer.
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 Shanghai, what time is it in Tehran?
When it is 12:00 AM (midnight) in Shanghai (CST), it is -4h 30m later in Tehran (IRST).
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