BTT to IST Time Converter

Convert Bhutan Time (BTT) to India Standard Time (IST). Both time zones are shown live below; current offset between them is 0h 30m behind.

Thimphu · Bhutan Time
09:22:08
Wednesday, May 13, 2026
GMT+6 · UTC+06:00
Mumbai · India Standard Time
08:52:08
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

From: BTT (Thimphu)
To: IST (Mumbai)
--:--

Daylight Saving status right now

BTT (Bhutan Time)
Observes DST
No
IST (India Standard Time)
Observes DST
No

When can BTT and IST meet?

00
01
02
03
04
05
06
07
08
09
10
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13
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BTT
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Thimphu (BTT). Each row shows the local working-hours state in that zone for the same moment in time.
7 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 10:00–16:00 BTT (09:30–15:30 IST).

Hour-by-hour BTT to IST conversion table

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

Bhutan Time (BTT)
IANA identifier
Asia/Thimphu
Current UTC offset
UTC+06:00
Current abbreviation
GMT+6
Major cities in this zone
Thimphu
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 Thimphu and Mumbai

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

Related converters

IST to BTT (reverse)BTT to ESTBTT to PSTBTT to GMTBTT to UTCBTT to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Thimphu or time in Mumbai.

Frequently asked questions

What is the time difference between BTT and IST right now?+
IST (India Standard Time) is currently 0h 30m behind BTT (Bhutan Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does BTT or IST observe daylight saving time?+
BTT: does not observe daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between BTT and IST?+
The strongest overlap is 10:00–16:00 BTT (09:30–15:30 IST), giving 7 hours when both sides are within standard 9am-5pm working hours.
What time is it in Mumbai when it is 12:00 noon in Thimphu?+
When it is 12:00 Wed in Thimphu (BTT), it is 11:30 Wed in Mumbai (IST).
Which IANA time zone identifiers are used for BTT and IST?+
BTT maps to "Asia/Thimphu" 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 Thimphu ahead of or behind Mumbai?+
Whether Thimphu (BTT) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 0h 30m behind BTT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for BTT and IST?+
BTT is UTC+06:00 (GMT+6) 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 BTT and IST?+
Yes. There are 7 hours of overlap during standard 9am-5pm working hours, with the strongest window at 10:00–16:00 BTT.