TRT to IST Time Converter
IST is 2 hours and 30 minutes ahead of TRT. TRT is UTC+3:00, and IST is UTC+5:30.
Best Time to Call Between TRT and IST
Both zones are inside normal business hours between 9:00 AM and 3:00 PM TRT — that's 11:30 AM to 5:30 PM IST. That's a 6-hour window.
both at work TRT only IST only neither — hours along the strip are TRT.
Common Times Converted
TRT on the left, IST on the right.
TRT to IST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| TRT | IST | Working hours |
|---|---|---|
| 12:00 AM | 2:30 AM | — |
| 1:00 AM | 3:30 AM | — |
| 2:00 AM | 4:30 AM | — |
| 3:00 AM | 5:30 AM | — |
| 4:00 AM | 6:30 AM | — |
| 5:00 AM | 7:30 AM | — |
| 6:00 AM | 8:30 AM | — |
| 7:00 AM | 9:30 AM | IST only |
| 8:00 AM | 10:30 AM | IST only |
| 9:00 AM | 11:30 AM | Both zones |
| 10:00 AM | 12:30 PM | Both zones |
| 11:00 AM | 1:30 PM | Both zones |
| 12:00 PM | 2:30 PM | Both zones |
| 1:00 PM | 3:30 PM | Both zones |
| 2:00 PM | 4:30 PM | Both zones |
| 3:00 PM | 5:30 PM | TRT only |
| 4:00 PM | 6:30 PM | TRT only |
| 5:00 PM | 7:30 PM | — |
| 6:00 PM | 8:30 PM | — |
| 7:00 PM | 9:30 PM | — |
| 8:00 PM | 10:30 PM | — |
| 9:00 PM | 11:30 PM | — |
| 10:00 PM | 12:30 AM next day | — |
| 11:00 PM | 1:30 AM next day | — |
What TRT and IST Actually Are
TRT — Turkey Time
Istanbul, Ankara, İzmir. Standing at UTC+3:00 as written, and the region does not change its clocks, so that offset holds all year. Turkey moved to permanent UTC+3 in 2016 and no longer changes its clocks.
Turkey abandoned clock changes in 2016 by remaining permanently on summer time, so it is now an hour ahead of its Greek and Bulgarian neighbors all year.
IST — India Standard Time
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad — and Colombo. Standing at UTC+5:30 as written, and the region does not change its clocks, so that offset holds all year. IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.
India runs a single time zone across a country wide enough for two, which is why sunrise in the north-east can come nearly two hours before Mumbai's. Proposals for a second zone resurface regularly and have never been adopted.
What This Means in Practice
Expect times on the half hour
IST sits on a 30-minute offset rather than a whole hour, so a round number on one side is never a round number on the other. A 9:00 meeting becomes 30 minutes past the hour, which is exactly the detail calendar invitations get wrong when someone converts in their head.
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Major Cities in Each Zone
Cities on TRT
Cities on IST
Frequently Asked Questions
What is the time difference between TRT and IST?
IST is 2 hours and 30 minutes ahead of TRT.
What is 9:00 AM TRT in IST?
9:00 AM TRT is 11:30 AM IST.
What are the best hours to schedule a call between TRT and IST?
Between 9:00 AM and 3:00 PM TRT, which is 11:30 AM to 5:30 PM IST. Both sides are inside normal business hours through that window.
Does the difference between TRT and IST change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does TRT always mean Turkey Time?
Turkey moved to permanent UTC+3 in 2016 and no longer changes its clocks.
Does IST always mean India Standard Time?
IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.