What is the time difference between HST and ICT?

Indochina Time (ICT) is 17 hours ahead of Hawaii Standard Time (HST). HST uses a UTC offset of UTC-10, while ICT uses UTC+7. For example, when it's 9:00 AM in HST, it's 2:00 AM in ICT. This difference remains constant year-round since neither timezone observes daylight saving time. Use the conversion table above to see the exact time for each hour of the day.

How do I convert HST to ICT?

To convert HST to ICT, add 17 hours to the HST time. For example, 9:00 AM HST is 2:00 AM ICT, and 5:00 PM HST is 10:00 AM ICT. Since neither timezone observes DST, this conversion stays the same all year. You can also use the interactive converter above for quick, accurate results.

What time is it in ICT when it's noon in HST?

When it's 12:00 PM (noon) in HST, it's 5:00 AM in ICT. This is because ICT is 17 hours ahead of HST. Similarly, when it's 6:00 PM in HST, it's 11:00 AM in ICT. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours ahead is ICT from HST?

ICT is 17 hours ahead of HST. This means when it's 9:00 AM in HST, it's 2:00 AM in ICT, and when it's midnight in HST, it's 5:00 PM in ICT. This offset is constant throughout the year since neither timezone uses daylight saving time. The conversion table above provides a complete hour-by-hour mapping.

Is ICT ahead or behind HST?

ICT is ahead of HST by 17 hours. Clocks in ICT show a later time than HST, meaning the day starts earlier in ICT relative to HST. For example, when it's morning in HST, it's already afternoon or evening in ICT. This difference stays the same year-round.

Does HST observe daylight saving time?

No, Hawaii Standard Time does not observe daylight saving time. The UTC offset of UTC-10 remains the same year-round, making time conversions from HST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

Does ICT observe daylight saving time?

No, Indochina Time does not observe daylight saving time. The UTC offset of UTC+7 remains the same year-round, making time conversions to ICT more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

What is the best time to call from HST to ICT?

The best time for a call between HST and ICT is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in ICT during their work day, call between 4:00 PM and 12:00 AM your HST time. Avoid calling too early or late, as the 17 hours difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do HST and ICT ever have the same time?

No, HST and ICT are always 17 hours apart and never display the same clock time simultaneously. Neither timezone observes DST, so the difference is constant year-round with no seasonal variation. The 17 hours offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

HST to ICT Converter

Convert Hawaii Standard Time to Indochina Time. See the hour-by-hour conversion table below.

Timezone Details

Hawaii Standard Time

11:44 AM

Thursday, April 2, 2026

HST (UTC-10:00)

Indochina Time

4:44 AM

Friday, April 3, 2026

ICT (UTC+07:00)

Difference: +17 hours

HST DST: No

ICT DST: No

24-Hour Overview

HST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

ICT — 24-hour overview

5p5p

8p8p

10p

11p11p

12a

2a2a

5a5a

8a8a

10a

11a11a

12p

2p2p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

ICT to HST

Cities in These Timezones

HST Cities

Honolulu

ICT Cities

Bangkok Phuket Chiang Mai

More Tools

Compare HST & ICT Plan a Meeting (HST & ICT)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Hawaii Standard Time on Wikipedia Indochina Time on Wikipedia IANA Time Zone Database