IST to TOT Time Converter

Convert India Standard Time (IST) to Tonga Time (TOT). Both time zones are shown live below; current offset between them is 7h 30m ahead.

Mumbai · India Standard Time
00:48:07
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30
Nukualofa · Tonga Time
08:18:07
Wednesday, May 13, 2026
GMT+13 · UTC+13:00

Convert a specific time

From: IST (Mumbai)
To: TOT (Nukualofa)
--:--

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
TOT (Tonga Time)
Observes DST
No

When can IST and TOT meet?

00
01
02
03
04
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06
07
08
09
10
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IST
TOT
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.
1 hour of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–09:00 IST (16:30–16:30 TOT).

Hour-by-hour IST to TOT conversion table

IST time (Mumbai)TOT time (Nukualofa)Status
00:00 Wed07:30 WedOff-hours both sides
01:00 Wed08:30 WedOff-hours both sides
02:00 Wed09:30 WedTOT working
03:00 Wed10:30 WedTOT working
04:00 Wed11:30 WedTOT working
05:00 Wed12:30 WedTOT working
06:00 Wed13:30 WedTOT working
07:00 Wed14:30 WedTOT working
08:00 Wed15:30 WedTOT working
09:00 Wed16:30 WedBoth at work
10:00 Wed17:30 WedIST working
11:00 Wed18:30 WedIST working
12:00 Wed19:30 WedIST working
13:00 Wed20:30 WedIST working
14:00 Wed21:30 WedIST working
15:00 Wed22:30 WedIST working
16:00 Wed23:30 WedIST working
17:00 Wed00:30 ThuOff-hours both sides
18:00 Wed01:30 ThuOff-hours both sides
19:00 Wed02:30 ThuOff-hours both sides
20:00 Wed03:30 ThuOff-hours both sides
21:00 Wed04:30 ThuOff-hours both sides
22:00 Wed05:30 ThuOff-hours both sides
23:00 Wed06:30 ThuOff-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
Tonga Time (TOT)
IANA identifier
Pacific/Tongatapu
Current UTC offset
UTC+13:00
Current abbreviation
GMT+13
Major cities in this zone
Nuku'alofa

Sun today in Mumbai and Nukualofa

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

Related converters

TOT to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to TOTPST to TOTGMT to TOTUTC to TOTCET to TOT
Looking for local time? See time in Mumbai or time in Nuku'alofa.

Frequently asked questions

What is the time difference between IST and TOT right now?+
TOT (Tonga Time) is currently 7h 30m ahead 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 TOT observe daylight saving time?+
IST: does not observe daylight saving time. TOT: does not observe daylight saving time.
When is the best time to schedule a meeting between IST and TOT?+
The strongest overlap is 09:00–09:00 IST (16:30–16:30 TOT), giving 1 hour when both sides are within standard 9am-5pm working hours.
What time is it in Nukualofa when it is 12:00 noon in Mumbai?+
When it is 12:00 Wed in Mumbai (IST), it is 19:30 Wed in Nukualofa (TOT).
Which IANA time zone identifiers are used for IST and TOT?+
IST maps to "Asia/Kolkata" in the IANA database. TOT maps to "Pacific/Tongatapu". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Nukualofa?+
Whether Mumbai (IST) is ahead of or behind Nukualofa (TOT) depends on the current UTC offsets. Right now TOT is 7h 30m ahead IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and TOT?+
IST is UTC+05:30 (GMT+5:30) and TOT is UTC+13:00 (GMT+13). 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 TOT?+
Yes. There are 1 hour of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–09:00 IST.