What is the time difference between IST and HST?

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

To convert IST to HST, subtract 15 hours and 30 minutes from the IST time. For example, 9:00 AM IST is 5:30 PM HST, and 5:00 PM IST is 1:30 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 IST?

When it's 12:00 PM (noon) in IST, it's 8:30 PM in HST. This is because HST is 15 hours and 30 minutes behind IST. Similarly, when it's 6:00 PM in IST, it's 2:30 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 IST?

HST is 15 hours and 30 minutes behind IST. This means when it's 9:00 AM in IST, it's 5:30 PM in HST, and when it's midnight in IST, it's 8:30 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 IST?

HST is behind IST by 15 hours and 30 minutes. Clocks in HST show an earlier time than IST, meaning the day starts later in HST relative to IST. For example, when it's noon in IST, it's still 8:30 PM in HST. This difference stays the same year-round.

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 from IST 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 IST to HST?

The best time for a call between IST 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 12:30 AM and 8:30 AM your IST time. Avoid calling too early or late, as the 15 hours and 30 minutes 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 IST and HST ever have the same time?

No, IST and HST 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.

IST to HST Converter

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

Timezone Details

India Standard Time

5:22 AM

Friday, April 3, 2026

IST (UTC+05:30)

Hawaii Standard Time

1:52 PM

Thursday, April 2, 2026

HST (UTC-10:00)

Difference: -15h 30m

IST DST: No

HST DST: No

24-Hour Overview

IST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

HST — 24-hour overview

8a8a

10a

11a11a

12p

2p2p

5p5p

8p8p

10p

11p11p

12a

2a2a

5a5a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

HST to IST 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

IST Cities

Delhi Mumbai Kolkata Bangalore Chennai

HST Cities

Honolulu

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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