WorldClockTools.
WereldklokOmrekenenMeet PlannerCountdownsTrackingMarketsTools

WorldClockTools.

Time, simplified

Hulpmiddelen

  • Wereldklok
  • Tijdzone-omrekener
  • Timezone Reference
  • Watchlist
  • Vergaderplanner
  • Timer
  • Stopwatch
  • Date Calculators
  • Exact Time
  • Countdowns
  • Market Hours
  • Browse pages
  • Clock Widgets
  • Find meeting time
  • Recurring drift
  • Time until…
  • DST calendar
  • Cron translator
  • Status-page widget
  • Embed gallery
  • Eclipse calendar
  • DST pair drift
  • Travel brief
  • Public Holidays
  • Airports

Regions

  • Americas
  • Europe
  • Asia
  • Africa
  • Oceania

Popular Cities

  • New York
  • São Paulo
  • Mexico City
  • London
  • Paris
  • Berlin
  • Tokyo
  • Shanghai
  • Mumbai
  • Lagos

Omrekenaars

  • EST to PST
  • PST to IST
  • GMT to EST
  • CET to EST
  • IST to GMT

Hubs

  • City Compare
  • Business overlap
  • Market Hours
  • Open now
  • Countdowns
  • Tracking
  • US disclosures
  • EU disclosures
  • India disclosures
  • Browse hub
  • Tools hub
  • Airport indexes
PrivacyCookiesTermsImprintAccessibilityContactDo Not Sell or Share My Personal InformationLimit Use of Sensitive Personal Information

© 2026 WorldClockTools. Alle rechten voorbehouden.

Stadsgegevens van GeoNames (CC BY 4.0). Tijdzonegegevens uit de IANA-tijdzonedatabase.

  1. WorldClockTools
  2. Tijdzone-omrekener
  3. WEST -> IST

Timezone converter

WEST naar IST Converter.

WEST → ISTGap: +4h 30m3.5h 9-5 overlap

WEST to IST currently uses Western European Time in Africa/Casablanca and India Time in Asia/Kolkata as the live reference pair, with a +4h 30m live gap. WEST to IST matters whenever Casablanca and Mumbai need to coordinate across a +4h 30m gap. The WEST side covers Morocco and Portugal, while IST covers India and Israel — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.

Last updated Apr 26, 2026. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.

How this is calculated

How we calculate this
The current offset for each abbreviation is resolved against the live IANA timezone rules. Conversion accounts for DST transitions on both sides, so the gap between WEST and IST can change by an hour twice a year.
Data sources
IANA Time Zone Database (offsets, DST). City attribution from GeoNames (CC BY 4.0).
Update cadence
Page regenerates daily; live offset values reflect the moment the page is rendered.
Reverse: IST → WEST

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

WEST

Western European Time

Africa/Casablanca · GMT+1 +01:00

--:--:--

Major markets in this grouping include Casablanca, Rabat, Fes, Tangier.

To

IST

India Time

Asia/Kolkata · GMT+5:30 +05:30

--:--:--

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

Scheduling snapshot

Current gap

+4h 30m

WEST +01:00 vs IST +05:30

9-to-5 overlap

3.5h

WEST 9:00 AM previous day to 12:30 PM previous day

Representative countries

Morocco, Portugal, and Spain / India, Israel, and Sri Lanka

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

Pair context

WEST (Casablanca, +01:00) to IST (Mumbai, +05:30) is currently a +4h 30m conversion. Live coverage on the WEST side is anchored by Casablanca, Rabat, Fes, and Tangier; the IST side draws from Mumbai, Delhi, Bengaluru, and Hyderabad.

WEST to IST matters whenever Casablanca and Mumbai need to coordinate across a +4h 30m gap. The WEST side covers Morocco and Portugal, while IST covers India and Israel — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.

This pair runs between Europe or Africa and Asia or the Pacific. With +4h 30m between them, the late European morning often catches the early Asian evening, which is the practical window for cross-region operations and travel planning.

WEST follows seasonal clock changes through Africa/Casablanca, while IST stays on a fixed offset year-round. That asymmetry is the real differentiator on this page: the gap widens or narrows by an hour twice a year, so calendar invites scheduled in one season often look wrong in the other.

WEST and IST sit 4h 30m apart, with about 3.5h of shared 9-to-5 time. That is enough room for one daily standup plus one focused working session, which is what most cross-region teams actually use this overlap for.

Market coverage on both sides

WEST coverage on this page is led by Casablanca, Morocco, Rabat, Morocco, Fes, Morocco, and Tangier, Morocco, with 2 more in the live dataset. That mix is what makes WEST feel anchored to African business hubs in practice rather than just an abbreviation on a chart.

IST coverage is led by Mumbai, India, Delhi, India, Bengaluru, India, and Hyderabad, India, with 2 more anchoring the wider label family. Combined with the WEST side, this conversion ends up describing cross-region coordination that uses the morning-on-one-side, afternoon-on-the-other window for live work.

Digit-Roll Converter

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

FROM
1
4
:
3
0
TO
2
0
:
0
0

Common meeting times

WEST to IST meeting times

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

WESTISTDay relation
9:00 AM1:30 PMSun, Apr 26same day
12:00 PM4:30 PMSun, Apr 26same day
3:00 PM7:30 PMSun, Apr 26same day
6:00 PM10:30 PMSun, Apr 26same day
9:00 PM1:30 AMMon, Apr 27next day

IST to WEST meeting times

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

ISTWESTDay relation
9:00 AM4:30 AMMon, Apr 27same day
12:00 PM7:30 AMMon, Apr 27same day
3:00 PM10:30 AMMon, Apr 27same day
6:00 PM1:30 PMMon, Apr 27same day
9:00 PM4:30 PMMon, Apr 27same day

Operational notes

WEST to IST ranges from WEST 9:00 AM (which lands at IST 1:30 PM) through WEST 9:00 PM (IST 1:30 AM). Across this +4h 30m gap, the middle of the WEST range usually lands in the IST afternoon — the reliable window for live calls between the two — while the early and late edges drift into IST morning or evening.

IST to WEST ranges from IST 9:00 AM (which lands at WEST 4:30 AM) through IST 9:00 PM (WEST 4:30 PM). Across this +4h 30m gap, the middle of the IST range usually lands in the WEST afternoon — the reliable window for live calls between the two — while the early and late edges drift into WEST morning or evening.

Popular hour answers

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

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

What is 8 AM WEST in IST?

8 AM WEST = 12:30 PM IST (12:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 AM WEST in IST?

9 AM WEST = 1:30 PM IST (13:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 10 AM WEST in IST?

10 AM WEST = 2:30 PM IST (14:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 11 AM WEST in IST?

11 AM WEST = 3:30 PM IST (15:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 12 PM WEST in IST?

12 PM WEST = 4:30 PM IST (16:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 1 PM WEST in IST?

1 PM WEST = 5:30 PM IST (17:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 2 PM WEST in IST?

2 PM WEST = 6:30 PM IST (18:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 3 PM WEST in IST?

3 PM WEST = 7:30 PM IST (19:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 4 PM WEST in IST?

4 PM WEST = 8:30 PM IST (20:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 5 PM WEST in IST?

5 PM WEST = 9:30 PM IST (21:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 6 PM WEST in IST?

6 PM WEST = 10:30 PM IST (22:30). On today's live calendar that lands on Sun, Apr 26 in IST, which means the answer is a same day conversion rather than a static offset lookup.

What is 9 PM WEST in IST?

9 PM WEST = 1:30 AM IST (01:30). On today's live calendar that lands on Mon, Apr 27 in IST, which means the answer is a next day conversion rather than a static offset lookup.

Overlap window and DST radar

The live gap is +4h 30m right now, based on Africa/Casablanca at +01:00 and Asia/Kolkata at +05:30. Africa/Casablanca changes offset on February 7, 2027, so the gap moves to +5h 30m after that transition.

The most usable workday block right now is about 3.5 hours: WEST 9:00 AM previous day to 12:30 PM previous day, which lines up with IST 1:30 PM previous day to 5:00 PM previous day.

Africa/Casablanca changes from +00:00 (GMT+0) to +00:00 (GMT+0) on February 7, 2027 at about 2:15 AM.

Reference zones

Africa/Casablanca

GMT+1 · +01:00

Asia/Kolkata

GMT+5:30 · +05:30

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

Omrekeningstabel

WESTIST
01:0005:30
02:0006:30
03:0007:30
04:0008:30
05:0009:30
06:0010:30
07:0011:30
08:0012:30
09:0013:30
10:0014:30
11:0015:30
12:0016:30
13:0017:30
14:0018:30
15:0019:30
16:0020:30
17:0021:30
18:0022:30
19:0023:30
20:0000:30
21:0001:30
22:0002:30
23:0003:30
00:0004:30

Top cities using WEST

Countries represented here include Morocco, Portugal, and Spain.

CasablancaMoroccoRabatMoroccoFesMoroccoTangierMoroccoMarrakeshMoroccoSaléMoroccoAgadirMoroccoMeknesMoroccoOujdaMoroccoLisbonPortugal

Top cities using IST

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

MumbaiIndiaDelhiIndiaBengaluruIndiaHyderabadIndiaAhmedabadIndiaChennaiIndiaKolkataIndiaSuratIndiaPuneIndiaJaipurIndia

FAQ

How many hours is IST ahead of WEST?
IST is currently +4h 30m relative to WEST, using Africa/Casablanca and Asia/Kolkata as the live reference zones on this page.
What is the best workday overlap between WEST and IST?
The current 9-to-5 overlap is about 3.5 hours: WEST 9:00 AM previous day to 12:30 PM previous day, which matches IST 1:30 PM previous day to 5:00 PM previous day.
Does the WEST-IST time difference change during DST?
The live gap is +4h 30m right now, based on Africa/Casablanca at +01:00 and Asia/Kolkata at +05:30. Africa/Casablanca changes offset on February 7, 2027, so the gap moves to +5h 30m after that transition.
Which cities commonly use WEST and IST?
WEST commonly covers cities such as Casablanca, Rabat, Fes, and Tangier, while IST commonly covers cities such as Mumbai, Delhi, Bengaluru, and Hyderabad.
Should I use WEST/IST or exact IANA zones?
Use the abbreviations for a quick read, but use exact IANA zones such as Africa/Casablanca and Asia/Kolkata when you need something precise in software, travel plans, or long-range scheduling.
Open Interactieve Converter

Gerelateerde Conversies

EST → ISTPST → ISTCST → ISTMST → ISTGMT → ISTUTC → ISTIST → CETIST → CESTIST → JSTIST → AESTIST → AEDTIST → BST

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.