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City data by GeoNames (CC BY 4.0). Timezone data from IANA Time Zone Database.

  1. WorldClockTools
  2. Time Zone Converter
  3. IST -> ICT

Timezone converter

IST to ICT Converter.

IST → ICTGap: +1h 30m6.5h 9-5 overlap

IST to ICT currently uses India Time in Asia/Kolkata and Indochina Time in Asia/Ho_Chi_Minh as the live reference pair. Right now the gap is +1h 30m, and the sections below break that into meeting-time shortcuts, workday overlap, DST changes, and city coverage on both sides.

Last updated Apr 22, 2026. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.

Reverse: ICT → IST

Ambiguity note

IST is ambiguous in this dataset, so the live converter uses Asia/Kolkata as the busiest reference zone while the city list below shows the wider label family.

From

IST

India Time

Asia/Kolkata · GMT+5:30 +05:30

--:--:--

Major markets in this grouping include Mumbai, Delhi, Bengaluru, Hyderabad.

To

ICT

Indochina Time

Asia/Ho_Chi_Minh · GMT+7 +07:00

--:--:--

Major markets in this grouping include Ho Chi Minh City, Hanoi, Bangkok, Haiphong.

Scheduling snapshot

Current gap

+1h 30m

IST +05:30 vs ICT +07:00

9-to-5 overlap

6.5h

IST 9:00 AM previous day to 3:30 PM previous day

Representative countries

India, Israel, and Sri Lanka / Vietnam, Thailand, and Cambodia

Based on the busiest city and zone usage found in the current dataset.

Pair context

IST and ICT currently connect Mumbai and Ho Chi Minh City with a live gap of +1h 30m. Representative coverage on the IST side is anchored by Mumbai, Delhi, Bengaluru, and Hyderabad, while the ICT side is anchored by Ho Chi Minh City, Hanoi, Bangkok, and Haiphong.

Using a simple 9:00 AM to 5:00 PM workday on both sides, the pair shares about 6.5 hours of business overlap - roughly IST 9:00 AM previous day to 3:30 PM previous day, which is ICT 10:30 AM previous day to 5:00 PM previous day. Most of the workday still lines up, which is helpful for live support, same-day reviews, and straightforward calendar invites.

The live gap is +1h 30m right now, based on Asia/Kolkata at +05:30 and Asia/Ho_Chi_Minh at +07:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.

Market coverage on both sides

On the IST side, the current dataset is anchored by cities such as Mumbai, India; Delhi, India; Bengaluru, India; Hyderabad, India; Ahmedabad, India; Chennai, India. That makes this page useful for real-world coordination patterns rather than only abstract offset math.

On the ICT side, the live reference set includes Ho Chi Minh City, Vietnam; Hanoi, Vietnam; Bangkok, Thailand; Haiphong, Vietnam; Phnom Penh, Cambodia; Cần Thơ, Vietnam. In practice, that means the conversion is tied to recognizable business, travel, and support hubs rather than a single anonymous timezone label.

Country usage on the two sides currently includes India, Israel, and Sri Lanka for IST and Vietnam, Thailand, and Cambodia for ICT. That country coverage helps explain why some pairs feel like outsourcing, logistics, gaming, finance, or travel-heavy conversions while others are more niche.

Digit-Roll Converter

Adjust the time — digits roll like an odometer. Swap button flips the zones.

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Common meeting times

IST to ICT meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

ISTICTDay relation
9:00 AM10:30 AMWed, Apr 22same day
12:00 PM1:30 PMWed, Apr 22same day
3:00 PM4:30 PMWed, Apr 22same day
6:00 PM7:30 PMWed, Apr 22same day
9:00 PM10:30 PMWed, Apr 22same day

ICT to IST meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

ICTISTDay relation
9:00 AM7:30 AMWed, Apr 22same day
12:00 PM10:30 AMWed, Apr 22same day
3:00 PM1:30 PMWed, Apr 22same day
6:00 PM4:30 PMWed, Apr 22same day
9:00 PM7:30 PMWed, Apr 22same day

Operational notes

IST to ICT meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 10:30 AM, while 9:00 PM lands at 10:30 PM, which makes the practical handoff window much easier to scan.

ICT to IST meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 7:30 AM, while 9:00 PM lands at 7:30 PM, which makes the practical handoff window much easier to scan.

Popular hour answers

These direct answers are here for the exact-intent searches people actually use, like “10 AM IST to ICT” or “4 PM IST in ICT”.

8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM9 PM

What is 8 AM IST in ICT?

8 AM IST = 9:30 AM ICT (09:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 AM IST in ICT?

9 AM IST = 10:30 AM ICT (10:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 10 AM IST in ICT?

10 AM IST = 11:30 AM ICT (11:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 11 AM IST in ICT?

11 AM IST = 12:30 PM ICT (12:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 12 PM IST in ICT?

12 PM IST = 1:30 PM ICT (13:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 1 PM IST in ICT?

1 PM IST = 2:30 PM ICT (14:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 2 PM IST in ICT?

2 PM IST = 3:30 PM ICT (15:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 3 PM IST in ICT?

3 PM IST = 4:30 PM ICT (16:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 4 PM IST in ICT?

4 PM IST = 5:30 PM ICT (17:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 5 PM IST in ICT?

5 PM IST = 6:30 PM ICT (18:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 6 PM IST in ICT?

6 PM IST = 7:30 PM ICT (19:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 PM IST in ICT?

9 PM IST = 10:30 PM ICT (22:30). On today's live calendar that lands on Wed, Apr 22 in ICT, which means the answer is a same day conversion rather than a static offset lookup.

Overlap window and DST radar

The live gap is +1h 30m right now, based on Asia/Kolkata at +05:30 and Asia/Ho_Chi_Minh at +07:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.

The most usable workday block right now is about 6.5 hours: IST 9:00 AM previous day to 3:30 PM previous day, which lines up with ICT 10:30 AM previous day to 5:00 PM previous day.

Reference zones

Asia/Kolkata

GMT+5:30 · +05:30

Asia/Ho_Chi_Minh

GMT+7 · +07:00

These are the busiest live references selected from the abbreviation families on this page.

Conversion Table

ISTICT
05:3007:00
06:3008:00
07:3009:00
08:3010:00
09:3011:00
10:3012:00
11:3013:00
12:3014:00
13:3015:00
14:3016:00
15:3017:00
16:3018:00
17:3019:00
18:3020:00
19:3021:00
20:3022:00
21:3023:00
22:3000:00
23:3001:00
00:3002:00
01:3003:00
02:3004:00
03:3005:00
04:3006:00

Top cities using IST

Countries represented here include India, Israel, and Sri Lanka.

MumbaiIndiaDelhiIndiaBengaluruIndiaHyderabadIndiaAhmedabadIndiaChennaiIndiaKolkataIndiaSuratIndiaPuneIndiaJaipurIndia

Top cities using ICT

Countries represented here include Vietnam, Thailand, and Cambodia.

Ho Chi Minh CityVietnamHanoiVietnamBangkokThailandHaiphongVietnamPhnom PenhCambodiaCần ThơVietnamHuếVietnamDa NangVietnamBiên HòaVietnamThanh HóaVietnam

FAQ

How many hours is ICT ahead of IST?
ICT is currently +1h 30m relative to IST, using Asia/Kolkata and Asia/Ho_Chi_Minh as the live reference zones on this page.
What is the best workday overlap between IST and ICT?
The current 9-to-5 overlap is about 6.5 hours: IST 9:00 AM previous day to 3:30 PM previous day, which matches ICT 10:30 AM previous day to 5:00 PM previous day.
Does the IST-ICT time difference change during DST?
The live gap is +1h 30m right now, based on Asia/Kolkata at +05:30 and Asia/Ho_Chi_Minh at +07:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
Which cities commonly use IST and ICT?
IST commonly covers cities such as Mumbai, Delhi, Bengaluru, and Hyderabad, while ICT commonly covers cities such as Ho Chi Minh City, Hanoi, Bangkok, and Haiphong.
Should I use IST/ICT or exact IANA zones?
Use the abbreviations for a quick read, but use exact IANA zones such as Asia/Kolkata and Asia/Ho_Chi_Minh when you need something precise in software, travel plans, or long-range scheduling.
Open Interactive Converter

Related Conversions

EST → ISTEST → ICTPST → ISTPST → ICTCST → ISTCST → ICTMST → ISTMST → ICTGMT → ISTGMT → ICTUTC → ISTUTC → ICT

Related planning pages

Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.

Interactive converter

Move from this static pair into the full timezone converter with more cities and abbreviations.

Compare city pairs

Use compare pages when the practical question is overlap, not just offset arithmetic.

World clock

Open live city clocks after narrowing the timezone pair you care about.

Browse city pages

Jump into the strongest city pages when you want location-specific timezone context.