Tehran to Singapore Time
IRST to SGT Converter — 9 AM IRST is 1:30 PM SGT
Tehran is 4 hours and 30 minutes behind Singapore. Convert any time between Tehran (IRST/IRDT) and Singapore (SGT) instantly.
Tehran
Iran
Singapore
Singapore
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Time Zone Comparison
Tehran to Singapore Time Conversion Table
| Tehran (IRST) | Singapore (SGT) |
|---|---|
| 12:00 AM | 4:30 AM |
| 2:00 AM | 6:30 AM |
| 4:00 AM | 8:30 AM |
| 6:00 AM | 10:30 AM |
| 8:00 AM | 12:30 PM |
| 10:00 AM | 2:30 PM |
| 12:00 PM | 4:30 PM |
| 2:00 PM | 6:30 PM |
| 4:00 PM | 8:30 PM |
| 6:00 PM | 10:30 PM |
| 8:00 PM | 12:30 AM |
| 10:00 PM | 2:30 AM |
Tehran & Singapore — Business & Scheduling Guide
Tehran (Iran) is an important regional economy, with key industries in diverse sectors including services and trade. Singapore (Singapore) is a major global financial center and shipping hub, known for finance, biotechnology, electronics, and logistics. With a 4.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Tehran and Singapore
The 4.5-hour difference between Tehran and Singapore requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Business hours typically follow a 9 AM–5 PM schedule. Singapore's business hours are typically 9 AM–6 PM, with a multicultural and efficiency-driven work environment. Teams often designate specific "overlap hours" for real-time collaboration and use asynchronous communication (Slack, email, recorded video) for the rest of the day.
Daylight Saving Time Considerations
Tehran observes Daylight Saving Time (IRST/IRDT), but Singapore does not — it stays on SGT year-round. This means the time difference between Tehran and Singapore changes by 1 hour when Tehran switches clocks. During Iran's summer, the gap is 3.5–5.5 hours instead of the standard 4.5 hours. Mark DST transition dates on your calendar to avoid missed meetings.
IRST to SGT — Quick Reference
IRST (IRST/IRDT) stands for the timezone used in Tehran, Iran (UTC+3:30). SGT (SGT) is the timezone used in Singapore, Singapore (UTC+8). Tehran is 4 hours and 30 minutes behind Singapore.
To convert IRST to SGT, add 4.5 hours to IRST time. For example, IRST 9:00 AM = SGT 1:30 PM.
Key Facts
- •Time difference: Tehran (UTC+3:30) is 4 hours and 30 minutes behind Singapore (UTC+8).
- •Daylight Saving Time: Tehran observes DST (IRST/IRDT). Singapore does not observe DST (SGT).
- •Regions: Tehran is located in Iran and uses the IRST/IRDT time zone. Singapore is located in Singapore and uses the SGT time zone.
- •Best time to call: The best time to call between Tehran and Singapore is 9:00 AM to 12:00 PM in Tehran time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Tehran and Singapore?
Tehran is 4 hours and 30 minutes behind Singapore.
What time is it in Singapore when it's 9 AM in Tehran?
When it's 9:00 AM in Tehran, it is 1:30 PM in Singapore.
What time is 9 PM IRST in SGT?
9 PM IRST (Tehran time) is 1:30 AM SGT (Singapore time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Tehran and Singapore?
The best time to schedule a meeting is between 9:00 AM to 12:00 PM in Tehran time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert IRST to SGT?
IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). SGT (SGT) is the timezone for Singapore, Singapore (UTC+8). Tehran is 4 hours and 30 minutes behind Singapore. Quick examples: 9 AM IRST = 1:30 PM SGT, 12 PM IRST = 4:30 PM SGT, 3 PM IRST = 7:30 PM SGT, 6 PM IRST = 10:30 PM SGT.
Is Tehran ahead of or behind Singapore?
Tehran is 4 hours 30 minutes behind Singapore. When it's noon in Tehran, it's 4:30 PM in Singapore.
Does Tehran or Singapore change clocks for Daylight Saving Time?
Yes, Tehran observes DST and switches between IRST/IRDT. Singapore does not observe DST — it stays on SGT year-round. Because only one city observes DST, the time difference shifts by 1 hour during transition periods (typically March/April and October/November).
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