WEST to IST Time Converter

Convert Western European Summer Time (WEST) to India Standard Time (IST). Both time zones are shown live below; current offset between them is 4h 30m ahead.

Lisbon · Western European Summer Time
11:13:40
Tuesday, May 12, 2026
GMT+1 · UTC+01:00
Mumbai · India Standard Time
15:43:40
Tuesday, May 12, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

From: WEST (Lisbon)
To: IST (Mumbai)
--:--

Daylight Saving status right now

WEST (Western European Summer Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00
IST (India Standard Time)
Observes DST
No

Heads up: WEST observes DST while IST does not. The 4.5-hour difference shown above will shift by one hour when WEST starts or ends DST.

When can WEST and IST meet?

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01
02
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09
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WEST
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Lisbon (WEST). Each row shows the local working-hours state in that zone for the same moment in time.
4 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–12:00 WEST (13:30–16:30 IST).

Hour-by-hour WEST to IST conversion table

WEST time (Lisbon)IST time (Mumbai)Status
00:00 Tue04:30 TueOff-hours both sides
01:00 Tue05:30 TueOff-hours both sides
02:00 Tue06:30 TueOff-hours both sides
03:00 Tue07:30 TueOff-hours both sides
04:00 Tue08:30 TueOff-hours both sides
05:00 Tue09:30 TueIST working
06:00 Tue10:30 TueIST working
07:00 Tue11:30 TueIST working
08:00 Tue12:30 TueIST working
09:00 Tue13:30 TueBoth at work
10:00 Tue14:30 TueBoth at work
11:00 Tue15:30 TueBoth at work
12:00 Tue16:30 TueBoth at work
13:00 Tue17:30 TueWEST working
14:00 Tue18:30 TueWEST working
15:00 Tue19:30 TueWEST working
16:00 Tue20:30 TueWEST working
17:00 Tue21:30 TueOff-hours both sides
18:00 Tue22:30 TueOff-hours both sides
19:00 Tue23:30 TueOff-hours both sides
20:00 Tue00:30 WedOff-hours both sides
21:00 Tue01:30 WedOff-hours both sides
22:00 Tue02:30 WedOff-hours both sides
23:00 Tue03:30 WedOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Western European Summer Time (WEST)
IANA identifier
Europe/Lisbon
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
Lisbon
India Standard Time (IST)
IANA identifier
Asia/Kolkata
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
MumbaiNew DelhiBangaloreChennaiKolkata

Sun today in Lisbon and Mumbai

Mumbai
Sunrise
06:06
Sunset
19:05
Solar noon
12:36
Daylight
12h 59m

Related converters

IST to WEST (reverse)WEST to ESTWEST to PSTWEST to GMTWEST to UTCWEST to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Lisbon or time in Mumbai.

Frequently asked questions

What is the time difference between WEST and IST right now?+
IST (India Standard Time) is currently 4h 30m ahead WEST (Western European Summer Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does WEST or IST observe daylight saving time?+
WEST: observes daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between WEST and IST?+
The strongest overlap is 09:00–12:00 WEST (13:30–16:30 IST), giving 4 hours when both sides are within standard 9am-5pm working hours.
What time is it in Mumbai when it is 12:00 noon in Lisbon?+
When it is 12:00 Tue in Lisbon (WEST), it is 16:30 Tue in Mumbai (IST).
Which IANA time zone identifiers are used for WEST and IST?+
WEST maps to "Europe/Lisbon" in the IANA database. IST maps to "Asia/Kolkata". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Lisbon ahead of or behind Mumbai?+
Whether Lisbon (WEST) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 4h 30m ahead WEST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for WEST and IST?+
WEST is UTC+01:00 (GMT+1) and IST is UTC+05:30 (GMT+5:30). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both WEST and IST?+
Yes. There are 4 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–12:00 WEST.