Question 1

What is the time difference between IST and JST right now?

Accepted Answer

India Standard Time (IST) is UTC+5:30 and Japan Standard Time (JST) is UTC+9. The exact time difference between IST and JST can change when one or both zones transition into or out of daylight saving time.

Question 2

Does IST or JST observe daylight saving time?

Accepted Answer

Daylight saving time observance varies by region. India Standard Time and Japan Standard Time may or may not observe DST. The converter on this page automatically adjusts for any DST changes in either IST or JST.

Question 3

When is the best time to schedule a meeting between IST and JST?

Accepted Answer

The best meeting window between IST and JST is shown on this page in the working-hours overlap section. It is computed from real 9am-5pm working windows in Mumbai and Tokyo for today.

Question 4

What time is it in Tokyo when it is 12:00 noon in Mumbai?

Accepted Answer

When it is 12:00 PM (noon) in Mumbai (IST), the equivalent time in Tokyo (JST) is shown in the hour-by-hour conversion table on this page. The converter accounts for daylight saving time wherever it applies.

Question 5

Which IANA time zone identifiers are used for IST and JST?

Accepted Answer

IST maps to the IANA identifier "Asia/Kolkata". JST maps to "Asia/Tokyo". These canonical identifiers are what most software libraries use to convert times accurately, including daylight saving handling.

Question 6

Is Mumbai ahead of or behind Tokyo?

Accepted Answer

Whether Mumbai (IST) is ahead of or behind Tokyo (JST) depends on the current UTC offsets shown on this page. The live converter and side-by-side clocks above will always reflect the current direction.

Question 7

What are the current UTC offsets for IST and JST?

Accepted Answer

IST is UTC+5:30 and JST is UTC+9. 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.

Question 8

Can I schedule meetings during business hours for both IST and JST?

Accepted Answer

The "When can IST and JST meet?" section on this page tells you whether the standard 9am-5pm working hours in Mumbai and Tokyo overlap, and if so, the exact window you can schedule a meeting without inconveniencing either side.

IST time (Mumbai)	JST time (Tokyo)	Status
00:00 Mon	03:30 Mon	Off-hours both sides
01:00 Mon	04:30 Mon	Off-hours both sides
02:00 Mon	05:30 Mon	Off-hours both sides
03:00 Mon	06:30 Mon	Off-hours both sides
04:00 Mon	07:30 Mon	Off-hours both sides
05:00 Mon	08:30 Mon	Off-hours both sides
06:00 Mon	09:30 Mon	JST working
07:00 Mon	10:30 Mon	JST working
08:00 Mon	11:30 Mon	JST working
09:00 Mon	12:30 Mon	Both at work
10:00 Mon	13:30 Mon	Both at work
11:00 Mon	14:30 Mon	Both at work
12:00 Mon	15:30 Mon	Both at work
13:00 Mon	16:30 Mon	Both at work
14:00 Mon	17:30 Mon	IST working
15:00 Mon	18:30 Mon	IST working
16:00 Mon	19:30 Mon	IST working
17:00 Mon	20:30 Mon	Off-hours both sides
18:00 Mon	21:30 Mon	Off-hours both sides
19:00 Mon	22:30 Mon	Off-hours both sides
20:00 Mon	23:30 Mon	Off-hours both sides
21:00 Mon	00:30 Tue	Off-hours both sides
22:00 Mon	01:30 Tue	Off-hours both sides
23:00 Mon	02:30 Tue	Off-hours both sides

IST to JST Time Converter

Convert a specific time

Daylight Saving status right now

When can IST and JST meet?

Hour-by-hour IST to JST conversion table

About these time zones

Sun today in Mumbai and Tokyo

Related converters

Frequently asked questions