ICT ↔ IST Time Converter

India Standard Time (IST) is 1h 30m behind of Indochina Time (ICT). This comes from ICT sitting at UTC+7 and IST at UTC+5:30. As a quick reference: when it is 9:00 AM in Bangkok, it is 7:30 AM in New Delhi. At noon in Bangkok (12:00 PM), New Delhi reads 10:30 AM. And 5:00 PM in Bangkok corresponds to 3:30 PM in New Delhi.

To convert ICT to IST by hand, subtract 1 hours 30 minutes to the ICT time. For example, 12:00 PM ICT becomes 10:30 AM IST. If the result goes past midnight, increment (or decrement) the calendar date accordingly — the converter on this page flags this with a "+1 Day" or "-1 Day" note automatically. For half-hour or 45-minute offsets, just carry the minutes over normally (e.g., 30 extra minutes means the result's minutes increase by 30, rolling over to the next hour if needed).

India Standard Time (IST) is 1h 30m behind of Indochina Time (ICT). Flipped the other way, ICT is 1h 30m ahead of IST. A practical example: if someone in New Delhi says "let's meet at noon," that maps to 1:30 PM ICT in Bangkok.

Indochina Time (ICT) is the civil time standard used across Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh and nearby regions. It sits at UTC+7 relative to Coordinated Universal Time (UTC). It does not observe Daylight Saving Time, meaning the UTC offset stays constant at UTC+7 all year — every day of the year. The zone encompasses major cities including Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh, Vientiane, Jakarta, Medan.

India Standard Time (IST) is the standard time used in New Delhi, Mumbai, Bangalore, Chennai and surrounding areas. It operates at UTC+5:30 from UTC. It does not observe Daylight Saving Time — the offset remains fixed at UTC+5:30 throughout the year with no seasonal adjustment. Cities in this zone include New Delhi, Mumbai, Bangalore, Chennai, Kolkata, Hyderabad, Colombo.

No. Neither ICT nor IST observes Daylight Saving Time, so the offset between them stays constant at 1h 30m behind throughout the entire year. This makes recurring meetings and schedule planning straightforward — no need to adjust for seasonal clock changes on either side.

The ideal meeting window is where standard business hours (roughly 9 AM – 6 PM) overlap in both zones. Given that IST is 1h 30m behind of ICT, mornings on the earlier side tend to align with afternoons on the later side. As a general rule: aim for 8 AM – 11 AM in the earlier zone to keep both sides in reasonable working hours. See the meeting hours table above for exact recommended slots for this specific pair. Avoid times that push either side before 7 AM or after 9 PM — those are shaded in the table.

Type any time directly into the IST input field in the bidirectional converter above — it calculates the ICT equivalent instantly and works equally well in both directions. Alternatively, add 1 hours 30 minutes from the IST time to get the ICT result manually. You can also visit the dedicated reverse page: IST to ICT converter ↗.

For certain hours, the conversion can cross midnight into the next or previous calendar day. When a converted time goes past 11:59 PM or before 12:00 AM, the date changes. The converter on this page shows a "+1 Day" label when the result falls on the next calendar day, and "-1 Day" when it falls the previous day. Always check this when sending calendar invites across these two zones — booking a "Tuesday 3 PM" meeting can accidentally land on Wednesday or Monday in the other zone if you miss the date shift.

Indochina Time (ICT) is used across the following cities and regions: Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh, Vientiane, Jakarta, Medan. The zone covers UTC+7, with no seasonal change — the same offset applies every day of the year. It is one of the standard time zones used for international scheduling and business.

India Standard Time (IST) covers New Delhi, Mumbai, Bangalore, Chennai, Kolkata, Hyderabad, Colombo among other locations. Running at UTC+5:30 with a fixed, year-round offset, it is the civil time standard for this part of the world. When coordinating across ICT and IST, use the live clocks at the top of this page to confirm the exact current local time in both zones before finalising any schedule.

The UTC+7 offset for Indochina Time was established to align civil time with the solar noon of the region it covers. Time zone boundaries are often drawn along political or geographic lines rather than purely at whole-hour intervals from UTC, which is why some zones like this one carry a non-standard offset.

Yes — the converter on this page is designed for exactly that. The live clocks update every second so you always see the current time in both zones at a glance. The editable input fields let you test any time instantly, and the 24-hour table gives you a quick reference for the whole day. For recurring meetings, the best approach is to pick a slot from the "Best Meeting Hours" table above and then lock it in your calendar with the correct timezone so it self-adjusts for any DST transitions automatically.