What is the time difference between ICT and HST?

Hawaii Standard Time (HST) is 17 hours behind Indochina Time (ICT). ICT uses a UTC offset of UTC+7, while HST uses UTC-10. For example, when it's 9:00 AM in ICT, it's 4:00 PM in HST. 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 ICT to HST?

To convert ICT to HST, subtract 17 hours from the ICT time. For example, 9:00 AM ICT is 4:00 PM HST, and 5:00 PM ICT is 12:00 AM HST. 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 HST when it's noon in ICT?

When it's 12:00 PM (noon) in ICT, it's 7:00 PM in HST. This is because HST is 17 hours behind ICT. Similarly, when it's 6:00 PM in ICT, it's 1:00 AM in HST. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is HST from ICT?

HST is 17 hours behind ICT. This means when it's 9:00 AM in ICT, it's 4:00 PM in HST, and when it's midnight in ICT, it's 7:00 AM in HST. 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 HST ahead or behind ICT?

HST is behind ICT by 17 hours. Clocks in HST show an earlier time than ICT, meaning the day starts later in HST relative to ICT. For example, when it's noon in ICT, it's still 7:00 PM in HST. This difference stays the same year-round.

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 from ICT more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

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 to HST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

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

The best time for a call between ICT and HST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in HST during their work day, call between 2:00 AM and 10:00 AM your ICT time. Avoid calling too early or late, as the 17 hours difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do ICT and HST ever have the same time?

No, ICT and HST 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.

ICT to HST Converter

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

Timezone Details

Indochina Time

9:53 AM

Friday, April 3, 2026

ICT (UTC+07:00)

Hawaii Standard Time

4:53 PM

Thursday, April 2, 2026

HST (UTC-10:00)

Difference: -17 hours

ICT DST: No

HST DST: No

24-Hour Overview

ICT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

HST — 24-hour overview

7a7a

10a10a

11a

12p

1p1p

4p4p

7p7p

10p10p

11p

12a

1a1a

4a4a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

HST to ICT

Cities in These Timezones

ICT Cities

Bangkok Phuket Chiang Mai

HST Cities

Honolulu

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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