IST to WEST Time Converter

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

Mumbai · India Standard Time
09:38:16
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30
Lisbon · Western European Summer Time
05:08:16
Wednesday, May 13, 2026
GMT+1 · UTC+01:00

Convert a specific time

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

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
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

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 IST and WEST meet?

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01
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09
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IST
WEST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Mumbai (IST). Each row shows the local working-hours state in that zone for the same moment in time.
3 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 14:00–16:00 IST (09:30–11:30 WEST).

Hour-by-hour IST to WEST conversion table

IST time (Mumbai)WEST time (Lisbon)Status
00:00 Wed19:30 TueOff-hours both sides
01:00 Wed20:30 TueOff-hours both sides
02:00 Wed21:30 TueOff-hours both sides
03:00 Wed22:30 TueOff-hours both sides
04:00 Wed23:30 TueOff-hours both sides
05:00 Wed00:30 WedOff-hours both sides
06:00 Wed01:30 WedOff-hours both sides
07:00 Wed02:30 WedOff-hours both sides
08:00 Wed03:30 WedOff-hours both sides
09:00 Wed04:30 WedIST working
10:00 Wed05:30 WedIST working
11:00 Wed06:30 WedIST working
12:00 Wed07:30 WedIST working
13:00 Wed08:30 WedIST working
14:00 Wed09:30 WedBoth at work
15:00 Wed10:30 WedBoth at work
16:00 Wed11:30 WedBoth at work
17:00 Wed12:30 WedWEST working
18:00 Wed13:30 WedWEST working
19:00 Wed14:30 WedWEST working
20:00 Wed15:30 WedWEST working
21:00 Wed16:30 WedWEST working
22:00 Wed17:30 WedOff-hours both sides
23:00 Wed18:30 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

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
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

Sun today in Mumbai and Lisbon

Mumbai
Sunrise
06:06
Sunset
19:06
Solar noon
12:36
Daylight
13h 0m

Related converters

WEST to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to WESTPST to WESTGMT to WESTUTC to WESTCET to WEST
Looking for local time? See time in Mumbai or time in Lisbon.

Frequently asked questions

What is the time difference between IST and WEST right now?+
WEST (Western European Summer Time) is currently 4h 30m behind IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IST or WEST observe daylight saving time?+
IST: does not observe daylight saving time. WEST: observes daylight saving time.
When is the best time to schedule a meeting between IST and WEST?+
The strongest overlap is 14:00–16:00 IST (09:30–11:30 WEST), giving 3 hours when both sides are within standard 9am-5pm working hours.
What time is it in Lisbon when it is 12:00 noon in Mumbai?+
When it is 12:00 Wed in Mumbai (IST), it is 07:30 Wed in Lisbon (WEST).
Which IANA time zone identifiers are used for IST and WEST?+
IST maps to "Asia/Kolkata" in the IANA database. WEST maps to "Europe/Lisbon". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Lisbon?+
Whether Mumbai (IST) is ahead of or behind Lisbon (WEST) depends on the current UTC offsets. Right now WEST is 4h 30m behind IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and WEST?+
IST is UTC+05:30 (GMT+5:30) and WEST is UTC+01:00 (GMT+1). 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 IST and WEST?+
Yes. There are 3 hours of overlap during standard 9am-5pm working hours, with the strongest window at 14:00–16:00 IST.