IRST to IST Time Zone Converter — Time Difference Between Tehran and Colombo
Drag the slider or click the time display to type a specific hour and instantly convert IRST to IST. The time difference between Tehran and Colombo is 2 hours — Colombo (IST) is ahead of Tehran (IRST) (UTC+3:30 vs UTC+5:30); for example, 9:00 AM IRST = 11:00 AM IST; to convert, add 2 hours. Use this IRST to IST time zone converter to check the live current time in both cities, browse the 24-hour IRST to IST conversion table, plan international meetings, find the best overlap hours, and account for daylight saving time changes automatically.
IRST
Iran Standard Time
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IST
India Standard Time
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IRST to IST Time Zone Difference — Hour-by-Hour Conversion Table
Scan each row to convert any IRST time to IST and find the exact time difference between Tehran and Colombo hour by hour. Amber-highlighted rows mark standard daytime business hours, making it easy to spot overlapping work windows for scheduling international meetings or remote team calls. Tap the arrows to jump between days, click "Today" to reset, and all daylight saving time transitions are handled automatically.
| IRST (Tehran) | IST (Colombo) |
|---|
What Time Is It Now in Tehran?
Live current local time in Tehran, Iran — IRST (UTC+3:30). Updates every second.
What Time Is It Now in Colombo?
Live current local time in Colombo, Sri Lanka — IST (UTC+5:30). Updates every second.
IRST to IST Quick Reference
Common business hours in Tehran converted to Colombo local time — handy for scheduling video calls, client meetings, and international conference calls.
IRST & IST Meeting Planner — Best Overlapping Hours
Use the color-coded conversion table above to find overlapping business hours between Tehran and Colombo. Amber rows mark standard daytime work hours (8 AM–6 PM local time) — pick a slot that falls in amber on both sides for a meeting time that works for everyone. Since IRST (UTC+3:30) is 2 hours ahead of IST (UTC+5:30), this time zone meeting planner is ideal for scheduling international calls, remote team standups, and cross-border project syncs.
Why Trust This Tehran to Colombo Time Zone Converter?
ConvertFlash uses the IANA Time Zone Database — the same authoritative source that powers your phone, browser, and every major operating system — so every Tehran to Colombo conversion handles daylight saving time transitions, half-hour UTC offsets, and historical time zone changes automatically. The live world clock updates every second, and the hour-by-hour conversion table regenerates correctly for any past or future date you select, making it reliable for both real-time checks and advance international scheduling.
IRST — Iran Standard Time
Tehran, Iran — UTC offset UTC+3:30
- Abbreviation
- IRST
- UTC Offset
- UTC+3:30
- City
- Tehran
- Country
- Iran
IST — India Standard Time
Colombo, Sri Lanka — UTC offset UTC+5:30
- Abbreviation
- IST
- UTC Offset
- UTC+5:30
- City
- Colombo
- Country
- Sri Lanka