Convert IRST to GMT — Time Difference Between Iran Standard Time and Bissau
Drag the slider or click the time display to type a specific hour and instantly convert IRST to GMT — Bissau is 3:30 hours behind Iran Standard Time. Scroll down to browse the full IRST to GMT conversion table, check what time 9 AM, 10 AM, 11 AM, or 12 PM in Tehran is in Bissau, and use the date picker to compare times on any day for accurate scheduling.
IRST
Iran Standard Time
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GMT
Bissau
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IRST to GMT Time Zone Difference — Hour-by-Hour Conversion Table
Scan each row to find what time any hour in Tehran is in Bissau — tap the arrows to jump between days, click "Today" to reset, and use the color-coded bands to quickly spot overlapping work hours, early mornings, and late nights at a glance.
| IRST (Tehran) | GMT (Bissau) |
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How to Convert IRST to GMT
Drag the slider on the IRST timeline to pick your time — the GMT time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.
What Is the Time Difference Between IRST and GMT?
Bissau (GMT) is 3:30 hours behind Iran Standard Time (IRST). To convert, subtract 3:30 hours — for example, 9:00 AM IRST is 5:30 AM GMT.
What Time Is It Now in Tehran?
What Time Is It Now in Bissau?
IRST to GMT Quick Reference
IRST to GMT Meeting Planner
Use the color-coded table above to find overlapping work hours between Tehran and Bissau. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.
Why Trust This IRST to GMT Converter?
Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.
Iran Standard Time
- Abbreviation
- IRST
- UTC Offset
- UTC+3:30
- City
- Tehran
- Country
- Iran
Bissau
- Abbreviation
- GMT
- UTC Offset
- UTC+0:00
- City
- Bissau
- Country
- Guinea-Bissau