What is the time difference between HST and IST?

India Standard Time (IST) is 15 hours and 30 minutes ahead of Hawaii Standard Time (HST). HST uses a UTC offset of UTC-10, while IST uses UTC+5:30. For example, when it's 9:00 AM in HST, it's 12:30 AM in IST. 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 IST?

To convert HST to IST, add 15 hours and 30 minutes to the HST time. For example, 9:00 AM HST is 12:30 AM IST, and 5:00 PM HST is 8:30 AM IST. 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 IST when it's noon in HST?

When it's 12:00 PM (noon) in HST, it's 3:30 AM in IST. This is because IST is 15 hours and 30 minutes ahead of HST. Similarly, when it's 6:00 PM in HST, it's 9:30 AM in IST. 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 IST from HST?

IST is 15 hours and 30 minutes ahead of HST. This means when it's 9:00 AM in HST, it's 12:30 AM in IST, and when it's midnight in HST, it's 3:30 PM in IST. 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 IST ahead or behind HST?

IST is ahead of HST by 15 hours and 30 minutes. Clocks in IST show a later time than HST, meaning the day starts earlier in IST relative to HST. For example, when it's morning in HST, it's already afternoon or evening in IST. 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 IST observe daylight saving time?

No, India Standard Time does not observe daylight saving time. The UTC offset of UTC+5:30 remains the same year-round, making time conversions to IST 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 IST?

The best time for a call between HST and IST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in IST during their work day, call between 5:30 PM and 1:30 AM your HST time. Avoid calling too early or late, as the 15 hours and 30 minutes 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 IST ever have the same time?

No, HST and IST are always 15 hours and 30 minutes 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 15 hours and 30 minutes 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 IST Converter

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

Timezone Details

Hawaii Standard Time

7:10 PM

Friday, April 3, 2026

HST (UTC-10:00)

India Standard Time

10:40 AM

Saturday, April 4, 2026

IST (UTC+05:30)

Difference: +15h 30m

HST DST: No

IST DST: No

24-Hour Overview

HST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

IST — 24-hour overview

3p3p

6p6p

9p9p

10p

11p

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

IST to HST EST to IST IST to EST PST to IST IST to PST GMT to IST IST to GMT IST to JST JST to IST

Cities in These Timezones

HST Cities

Honolulu

IST Cities

Delhi Mumbai Kolkata Bangalore Chennai

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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