India Standard Time (ist) is used in India. The IANA timezone identifier is Asia/Kolkata.

TOKYO (Tokyo) (tokyo) is used in Japan. The IANA timezone identifier is Asia/Tokyo.

IST to TOKYO Time Converter

India Standard Time → TOKYO (Tokyo)

IST = UTC+5:30TOKYO = UTC+9

⚠️ IST is ambiguous — on this page it means India Standard Time. It also refers to:

Ireland Standard Time (Dublin) → TOKYO ↗Israel Standard Time (Jerusalem) → TOKYO ↗

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

Tokyo

Japan · +3.5h

12:30

London

United Kingdom · -4.5h

04:30

New York

USA · -9.5h

23:30-1 day

Dubai

United Arab Emirates · -1.5h

07:30

Sydney

Australia · +4.5h

13:30

Time difference: IST (Mumbai) and Tokyo

IST (Mumbai) is 4 hours 30 minutes behind Tokyo. When IST (Mumbai) clocks hit noon, Tokyo reads 15:00.

IST (Mumbai) is in the Asia/Kolkata timezone. Tokyo is in Asia/Tokyo. The difference is 3.5 hours 30 minutes.

Business hours comparison

Every working day, IST (Mumbai) and Tokyo are both in business hours for 4.5 hours simultaneously.

00:0006:0012:0018:0024:00

IST (Mumbai)

Tokyo

Overlap (4.5h)

When to schedule across time zones

Both IST (Mumbai) and Tokyo are in standard hours simultaneously for 4.5h per day. 3 recommended slots shown below.

09:00 Mumbai / 12:00 Tokyo✓ Both working

10:00 Mumbai / 13:00 Tokyo✓ Both working

11:00 Mumbai / 14:00 Tokyo✓ Both working

Based on standard 09:00–17:00 working hours in each location's local time.

Holiday calendar for both locations

IST (Mumbai)

No upcoming public holidays this year.

Tokyo7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

Working across IST (Mumbai) and Tokyo

Working across IST (Mumbai) (India) and Tokyo (Japan) involves a 3.5-hour gap. The good news: there is a 4.5-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.

💡 Best practice for cross-timezone meetings

✅

09:00–10:00 in IST (Mumbai) = 12:00–13:00 in Tokyo. Both sides are in standard business hours during this window.

✅

10:00–11:00 in IST (Mumbai) = 13:00–14:00 in Tokyo. Both sides are in standard business hours during this window.

✅

11:00–12:00 in IST (Mumbai) = 14:00–15:00 in Tokyo. Both sides are in standard business hours during this window.

DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.

Get the Extension — Free →

Use the time slider above to find the exact equivalent time for any moment in IST (Mumbai). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

IST (Mumbai) ↔ TOKYO (Tokyo)

5h of business hours overlap daily (09:00–17:00)

IST (Mumbai)

TOKYO (Tokyo)

00:00

03:30

01:00

04:30

02:00

05:30

03:00

06:30

04:00

07:30

05:00

08:30

06:00

09:30Working

07:00

10:30Working

08:00

11:30Working

09:00Working

12:30Working

10:00Working

13:30Working

11:00Working

14:30Working

12:00Working

15:30Working

13:00Working

16:30Working

14:00Working

17:30off

15:00Working

18:30off

16:00Working

19:30off

17:00

20:30

18:00

21:30

19:00

22:30

20:00

23:30

21:00

00:30+1d

22:00

01:30+1d

23:00

02:30+1d

Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.

Frequently Asked Questions

What is the difference between ist and tokyo?

India Standard Time (ist) is UTC+5:30 and TOKYO (Tokyo) (tokyo) is UTC+9. The difference between them is 3.5 hours.

Where is ist used?

India Standard Time (ist) is used in India and surrounding regions. The IANA timezone identifier is Asia/Kolkata. Note: ist is ambiguous and may refer to other timezones.

Where is tokyo used?

TOKYO (Tokyo) (tokyo) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.

How do I convert ist to tokyo?

Use the interactive converter above. Drag the time slider to any ist time and the tokyo equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.

Popular IST conversions

IST → London IST → New York IST → Tokyo IST → Dubai IST → Sydney IST → Paris IST → Berlin IST → Singapore IST → Los Angeles IST → Toronto

Popular TOKYO conversions

London → TOKYO New York → TOKYO Dubai → TOKYO Sydney → TOKYO Paris → TOKYO Berlin → TOKYO Singapore → TOKYO Los Angeles → TOKYO Toronto → TOKYO Mumbai → TOKYO