TRT ↔ IST Time Converter

India Standard Time (IST) is 2h 30m ahead of Turkey Time (TRT). TRT runs at UTC+3 and IST at UTC+5:30. Quick time examples: 8:00 AM TRT = 10:30 AM IST; 12:00 PM TRT = 2:30 PM IST; 5:00 PM TRT = 7:30 PM IST.

To convert TRT to IST, add 2 hours 30 minutes to the TRT time. For example, 12:00 PM TRT becomes 2:30 PM IST. When the result crosses midnight, advance the date by one day (shown as "+1 Day" in the converter). Because IST uses a :30 offset, results always land on a :30-minute mark.

India Standard Time (IST) is 2h 30m ahead of Turkey Time (TRT). Reversed: TRT is 2h 30m behind of IST. Practical example: noon in New Delhi (12:00 PM IST) corresponds to 9:30 AM TRT in Istanbul, and 5 PM in New Delhi corresponds to 2:30 PM TRT.

Turkey Time (TRT) is the standard civil time for Istanbul and the surrounding region, operating at UTC+3 from UTC. It does not observe Daylight Saving Time; the UTC offset stays at UTC+3 every day of the year. Major cities: Istanbul, Ankara, Izmir, Bursa, Adana, Gaziantep, Konya.

India Standard Time (IST) covers New Delhi and the surrounding region at UTC+5:30 from UTC. It does not observe Daylight Saving Time — the offset is fixed at UTC+5:30 all year with no seasonal change. Cities in this zone: New Delhi, Mumbai, Bangalore, Chennai, Kolkata, Hyderabad, Colombo.

No — and this makes TRT–IST one of the simpler pairs to schedule across. Neither zone observes Daylight Saving Time, so the offset is exactly 2h 30m ahead every single day of the year. You can set up a recurring calendar invite once and never adjust it for seasonal clock changes on either side.

The best meeting window is where standard working hours (9 AM – 6 PM) overlap in both zones. Since IST is 2h 30m ahead of TRT, mornings in the earlier zone align with afternoons or evenings in the later zone. Target 8 AM – 11 AM in the earlier-offset zone to keep both sides in reasonable hours. The meeting hours table above shows the exact recommended slots for this pair. Any time where one side falls before 7 AM or after 9 PM is best avoided for regular team calls.

Type any time directly into the IST field in the bidirectional converter above — it instantly shows the TRT result. Alternatively, subtract 2 hours 30 minutes from the IST time manually. For a dedicated reverse page, visit: IST to TRT converter ↗.

For some hours of the day the conversion does cross midnight into the next or previous calendar day. When the converted time passes 11:59 PM, the date advances — the converter shows "+1 Day". When it goes before 12:00 AM, the date moves back — "-1 Day" appears. The 24-hour reference table also shows day changes in the Day column. Always check the date indicator when sending calendar invites across these two zones to avoid accidentally booking on the wrong date.

Turkey Time (TRT) is used in: Istanbul, Ankara, Izmir, Bursa, Adana, Gaziantep, Konya. The zone operates at UTC+3, with a constant offset all year.

India Standard Time (IST) covers: New Delhi, Mumbai, Bangalore, Chennai, Kolkata, Hyderabad, Colombo. It runs at UTC+5:30, fixed year-round with no DST change. Use the live clocks at the top of this page to see the current local time in both zones side by side.

Yes — since neither TRT nor IST observes DST, the offset is exactly 2h 30m ahead every day of the year without exception.

When creating a recurring meeting that spans TRT and IST, set the event timezone in your calendar app using the IANA timezone names: Europe/Istanbul for TRT and Asia/Kolkata for IST. Using IANA names rather than fixed UTC offsets ensures the calendar app automatically adjusts future occurrences for any DST changes, so you never accidentally schedule at the wrong time after a clock transition. For a quick lookup of any specific time, the converter on this page is the fastest way to verify both sides before you send the invite.

No. Turkey permanently adopted UTC+3 in 2016, effectively staying on what was previously its summer time offset and never switching back. Since then, TRT has been fixed at UTC+3 all year — no spring forward, no fall back. This means the Turkey side of any timezone pair is always stable, and any seasonal variation in the TRT–IST offset comes entirely from the other zone (though neither zone in this pair observes DST either, making the offset perfectly constant).

India Standard Time is fixed at UTC+5:30 rather than a whole-hour offset because India uses a single nationwide timezone. Given the country's wide east-west geographic span, a half-hour compromise best approximates solar noon across most of India without forcing two separate zones. No part of India observes Daylight Saving Time, so IST stays at UTC+5:30 every day of the year. The practical effect: any conversion involving IST will always land on a :30-minute mark (e.g., 8:00 AM TRT = 10:30 AM IST).