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  1. WorldClockTools
  2. 时区转换器
  3. IST -> LHST

Timezone converter

IST到LHST转换器.

IST → LHSTGap: +5h3h 9-5 overlap

IST to LHST currently uses India Time in Asia/Kolkata and Lord Howe Time in Australia/Lord_Howe as the live reference pair. Right now the gap is +5h, and the sections below break that into meeting-time shortcuts, workday overlap, DST changes, and city coverage on both sides.

Last updated Apr 22, 2026. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.

Reverse: LHST → IST

Ambiguity note

IST is ambiguous in this dataset, so the live converter uses Asia/Kolkata as the busiest reference zone while the city list below shows the wider label family.

From

IST

India Time

Asia/Kolkata · GMT+5:30 +05:30

--:--:--

Major markets in this grouping include Mumbai, Delhi, Bengaluru, Hyderabad.

To

LHST

Lord Howe Time

Australia/Lord_Howe · GMT+10:30 +10:30

--:--:--

This grouping is currently anchored by the reference zone Australia/Lord_Howe.

Scheduling snapshot

Current gap

+5h

IST +05:30 vs LHST +10:30

9-to-5 overlap

3h

IST 9:00 AM previous day to 12:00 PM previous day

Representative countries

India, Israel, and Sri Lanka / Australia

Based on the busiest city and zone usage found in the current dataset.

Pair context

IST and LHST currently connect Mumbai and Australia/Lord_Howe with a live gap of +5h. Representative coverage on the IST side is anchored by Mumbai, Delhi, Bengaluru, and Hyderabad, while the LHST side is anchored by Australia/Lord_Howe.

Using a simple 9:00 AM to 5:00 PM workday on both sides, the pair shares about 3 hours of business overlap - roughly IST 9:00 AM previous day to 12:00 PM previous day, which is LHST 2:00 PM previous day to 5:00 PM previous day. There is still a usable shared block in the morning or afternoon, so teams can usually meet without pushing too far outside standard hours.

The live gap is +5h right now, based on Asia/Kolkata at +05:30 and Australia/Lord_Howe at +10:30. Australia/Lord_Howe changes offset on October 4, 2026, so the gap moves to +5h 30m after that transition.

Market coverage on both sides

On the IST side, the current dataset is anchored by cities such as Mumbai, India; Delhi, India; Bengaluru, India; Hyderabad, India; Ahmedabad, India; Chennai, India. That makes this page useful for real-world coordination patterns rather than only abstract offset math.

On the LHST side, the live reference set includes . In practice, that means the conversion is tied to recognizable business, travel, and support hubs rather than a single anonymous timezone label.

Country usage on the two sides currently includes India, Israel, and Sri Lanka for IST and Australia for LHST. That country coverage helps explain why some pairs feel like outsourcing, logistics, gaming, finance, or travel-heavy conversions while others are more niche.

Digit-Roll Converter

Adjust the time — digits roll like an odometer. Swap button flips the zones.

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Common meeting times

IST to LHST meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

ISTLHSTDay relation
9:00 AM2:00 PMWed, Apr 22same day
12:00 PM5:00 PMWed, Apr 22same day
3:00 PM8:00 PMWed, Apr 22same day
6:00 PM11:00 PMWed, Apr 22same day
9:00 PM2:00 AMThu, Apr 23next day

LHST to IST meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

LHSTISTDay relation
9:00 AM4:00 AMThu, Apr 23same day
12:00 PM7:00 AMThu, Apr 23same day
3:00 PM10:00 AMThu, Apr 23same day
6:00 PM1:00 PMThu, Apr 23same day
9:00 PM4:00 PMThu, Apr 23same day

Operational notes

IST to LHST meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 2:00 PM, while 9:00 PM lands at 2:00 AM, which makes the practical handoff window much easier to scan.

LHST to IST meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 4:00 AM, while 9:00 PM lands at 4:00 PM, which makes the practical handoff window much easier to scan.

Popular hour answers

These direct answers are here for the exact-intent searches people actually use, like “10 AM IST to LHST” or “4 PM IST in LHST”.

8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM9 PM

What is 8 AM IST in LHST?

8 AM IST = 1:00 PM LHST (13:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 AM IST in LHST?

9 AM IST = 2:00 PM LHST (14:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 10 AM IST in LHST?

10 AM IST = 3:00 PM LHST (15:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 11 AM IST in LHST?

11 AM IST = 4:00 PM LHST (16:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 12 PM IST in LHST?

12 PM IST = 5:00 PM LHST (17:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 1 PM IST in LHST?

1 PM IST = 6:00 PM LHST (18:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 2 PM IST in LHST?

2 PM IST = 7:00 PM LHST (19:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 3 PM IST in LHST?

3 PM IST = 8:00 PM LHST (20:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 4 PM IST in LHST?

4 PM IST = 9:00 PM LHST (21:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 5 PM IST in LHST?

5 PM IST = 10:00 PM LHST (22:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 6 PM IST in LHST?

6 PM IST = 11:00 PM LHST (23:00). On today's live calendar that lands on Wed, Apr 22 in LHST, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 PM IST in LHST?

9 PM IST = 2:00 AM LHST (02:00). On today's live calendar that lands on Thu, Apr 23 in LHST, which means the answer is a next day conversion rather than a static offset lookup.

Overlap window and DST radar

The live gap is +5h right now, based on Asia/Kolkata at +05:30 and Australia/Lord_Howe at +10:30. Australia/Lord_Howe changes offset on October 4, 2026, so the gap moves to +5h 30m after that transition.

The most usable workday block right now is about 3 hours: IST 9:00 AM previous day to 12:00 PM previous day, which lines up with LHST 2:00 PM previous day to 5:00 PM previous day.

Australia/Lord_Howe changes from +11:00 (GMT+11) to +11:00 (GMT+11) on October 4, 2026 at about 2:39 AM.

Reference zones

Asia/Kolkata

GMT+5:30 · +05:30

Australia/Lord_Howe

GMT+10:30 · +10:30

These are the busiest live references selected from the abbreviation families on this page.

转换表

ISTLHST
05:3010:30
06:3011:30
07:3012:30
08:3013:30
09:3014:30
10:3015:30
11:3016:30
12:3017:30
13:3018:30
14:3019:30
15:3020:30
16:3021:30
17:3022:30
18:3023:30
19:3000:30
20:3001:30
21:3002:30
22:3003:30
23:3004:30
00:3005:30
01:3006:30
02:3007:30
03:3008:30
04:3009:30

Top cities using IST

Countries represented here include India, Israel, and Sri Lanka.

MumbaiIndiaDelhiIndiaBengaluruIndiaHyderabadIndiaAhmedabadIndiaChennaiIndiaKolkataIndiaSuratIndiaPuneIndiaJaipurIndia

Top cities using LHST

Countries represented here include Australia.

This abbreviation is represented here by the reference zone Australia/Lord_Howe, not by a large city cluster.

FAQ

How many hours is LHST ahead of IST?
LHST is currently +5h relative to IST, using Asia/Kolkata and Australia/Lord_Howe as the live reference zones on this page.
What is the best workday overlap between IST and LHST?
The current 9-to-5 overlap is about 3 hours: IST 9:00 AM previous day to 12:00 PM previous day, which matches LHST 2:00 PM previous day to 5:00 PM previous day.
Does the IST-LHST time difference change during DST?
The live gap is +5h right now, based on Asia/Kolkata at +05:30 and Australia/Lord_Howe at +10:30. Australia/Lord_Howe changes offset on October 4, 2026, so the gap moves to +5h 30m after that transition.
Which cities commonly use IST and LHST?
IST commonly covers cities such as Mumbai, Delhi, Bengaluru, and Hyderabad, while LHST commonly covers the reference zone Australia/Lord_Howe.
Should I use IST/LHST or exact IANA zones?
Use the abbreviations for a quick read, but use exact IANA zones such as Asia/Kolkata and Australia/Lord_Howe when you need something precise in software, travel plans, or long-range scheduling.
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相关转换

EST → ISTPST → ISTCST → ISTMST → ISTGMT → ISTUTC → ISTIST → CETIST → JSTIST → AESTIST → BSTIST → SGTIST → HKT

Related planning pages

Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.

Interactive converter

Move from this static pair into the full timezone converter with more cities and abbreviations.

Compare city pairs

Use compare pages when the practical question is overlap, not just offset arithmetic.

World clock

Open live city clocks after narrowing the timezone pair you care about.

Browse city pages

Jump into the strongest city pages when you want location-specific timezone context.