TOT to IST Time Converter

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

Nukualofa · Tonga Time
17:15:44
Wednesday, May 13, 2026
GMT+13 · UTC+13:00
Mumbai · India Standard Time
09:45:44
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

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

Daylight Saving status right now

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

When can TOT and IST meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
TOT
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Nukualofa (TOT). Each row shows the local working-hours state in that zone for the same moment in time.
No overlap during strict 9-5 working hours; some flexibility needed.
If both sides are willing to extend to 8am-7pm, the available window is 16:00–18:00 TOT (08:30–10:30 IST).

Hour-by-hour TOT to IST conversion table

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

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

Tonga Time (TOT)
IANA identifier
Pacific/Tongatapu
Current UTC offset
UTC+13:00
Current abbreviation
GMT+13
Major cities in this zone
Nuku'alofa
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 Nukualofa and Mumbai

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

Related converters

IST to TOT (reverse)TOT to ESTTOT to PSTTOT to GMTTOT to UTCTOT to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Nuku'alofa or time in Mumbai.

Frequently asked questions

What is the time difference between TOT and IST right now?+
IST (India Standard Time) is currently 7h 30m behind TOT (Tonga Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does TOT or IST observe daylight saving time?+
TOT: does not observe daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between TOT and IST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 16:00–18:00 TOT (08:30–10:30 IST).
What time is it in Mumbai when it is 12:00 noon in Nukualofa?+
When it is 12:00 Wed in Nukualofa (TOT), it is 04:30 Wed in Mumbai (IST).
Which IANA time zone identifiers are used for TOT and IST?+
TOT maps to "Pacific/Tongatapu" 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 Nukualofa ahead of or behind Mumbai?+
Whether Nukualofa (TOT) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 7h 30m behind TOT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for TOT and IST?+
TOT is UTC+13:00 (GMT+13) 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 TOT and IST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between TOT and IST is 16:00–18:00 TOT.