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IST to HST Time Converter

Use this IST to HST time converter to compare India and United States time instantly. HST is 15 hours and 30 minutes behind IST, so 9:00 AM IST becomes 5:30 PM (previous day) HST and 5:00 PM IST becomes 1:30 AM HST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.

IST India Standard Time
...
HST Hawaii Standard Time
...
Select a time to convert

IST to HST Quick Facts

Use this IST to HST converter to compare India and United States time, check the 15 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.

Time Difference
Hawaii Standard Time is 15 hours and 30 minutes behind India Standard Time
Useful when deadlines, handoffs, or calls cross workday boundaries.
Best Call Window
Normal business hours do not overlap well here, so test early-morning or late-evening compromise slots.
Common Use Cases
Useful for remote teams, customer support windows, travel planning, webinars, and same-day deadline handoffs.

How to Convert IST to HST

Converting between India Standard Time and Hawaii Standard Time means accounting for a 15 hours and 30 minutes gap — here's how to do it in under 10 seconds with no sign-up.

Enter Your IST Time

Pick the date and time in India Standard Time (UTC +5:30) that you want to convert. Hit "Now" to load the current IST time instantly, or use "+1h" to step forward and compare.

Read the HST Result

The equivalent Hawaii Standard Time (UTC -10) time appears immediately. Since HST is 15 hours and 30 minutes behind of IST, conversions often cross midnight — look for the date-change label.

Copy or Fine-Tune

Click "Copy Time" to grab the HST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.

Why Choose Our IST to HST Converter

Align IST–HST Meetings Instantly

With 15 hours and 30 minutes between IST and HST, business-hours overlap is limited. This tool instantly shows which hours work on both sides, so you can lock in a meeting without a chain of "does 3 PM work for you?" emails.

Spot Date-Line Shifts at a Glance

A IST evening at 9 PM is already the previous afternoon in HST. This converter flags date changes beside the result — critical when booking flights, hitting deadlines, or scheduling across the India–United States corridor.

Handles DST Transitions Automatically

The half-hour offset between IST (UTC +5:30) and HST (UTC -10) already makes mental math tricky — add Daylight Saving Time and the gap can shift further. This converter uses live UTC offsets, so you're always accurate.

Never Miss a IST-Timed Event

Product launches, sports matches, and webinars are often announced in IST. Convert the event time to HST so you know exactly when to tune in — with a 15 hours and 30 minutes difference, a morning event in India hits the evening in United States.

IST to HST Time Conversion Chart

Quick-reference conversion table covering every hour of the day at a glance.

Complete 24-Hour Conversion

India Standard Time to Hawaii Standard Time full day schedule

12:00 AM
IST
→
8:30 AM
HST
(previous day)
1:00 AM
IST
→
9:30 AM
HST
(previous day)
2:00 AM
IST
→
10:30 AM
HST
(previous day)
3:00 AM
IST
→
11:30 AM
HST
(previous day)
4:00 AM
IST
→
12:30 PM
HST
(previous day)
5:00 AM
IST
→
1:30 PM
HST
(previous day)
6:00 AM
IST
→
2:30 PM
HST
(previous day)
7:00 AM
IST
→
3:30 PM
HST
(previous day)
8:00 AM
IST
→
4:30 PM
HST
(previous day)
9:00 AM
IST
→
5:30 PM
HST
(previous day)
10:00 AM
IST
→
6:30 PM
HST
(previous day)
11:00 AM
IST
→
7:30 PM
HST
(previous day)
12:00 PM
IST
→
8:30 PM
HST
(previous day)
1:00 PM
IST
→
9:30 PM
HST
(previous day)
2:00 PM
IST
→
10:30 PM
HST
(previous day)
3:00 PM
IST
→
11:30 PM
HST
(previous day)
4:00 PM
IST
→
12:30 AM
HST
5:00 PM
IST
→
1:30 AM
HST
6:00 PM
IST
→
2:30 AM
HST
7:00 PM
IST
→
3:30 AM
HST
8:00 PM
IST
→
4:30 AM
HST
9:00 PM
IST
→
5:30 AM
HST
10:00 PM
IST
→
6:30 AM
HST
11:00 PM
IST
→
7:30 AM
HST
The two zones in context

IST vs HST — cities and working rhythm

IST — India Standard Time
Primary cities: Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata

Indian business hours run 10 AM – 7 PM IST typically; IT / BPO shifts commonly extend to cover US and UK working hours, so 3:30 PM – 12:30 AM IST (US overlap) and 12:30 PM – 9 PM IST (UK overlap) are the two second shifts you see most often. Weekend is Saturday-Sunday for most private-sector employers.

Popular IST Time Converters

Explore more IST conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.

Convert Other Time Zones to HST

Find the time difference from any major zone into Hawaii Standard Time. Use these pages when scheduling with United States from a different region.

🇺🇸 Swap direction — HST to IST Converter