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

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IST (Mumbai)BASE

09:00

00:0006:0012:0018:0024:00

Tokyo

Japan · +3.5h🔔 Public Holiday in 1d —  Shōwa Day

12:30

London

United Kingdom · -4.5h

04:30

New York

USA · -9.5h

-1 day23:30

Dubai

United Arab Emirates · -1.5h

07:30

Sydney

Australia · +4.5h

13:30

IST (Mumbai) ↔ Tokyo — time offset

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 the Asia/Tokyo timezone. The difference is 3.5 hours 30 minutes.

Business hours comparison

A 4.5-hour overlap exists between IST (Mumbai) and Tokyo each day during standard 9:00–17:00 working hours.

00:0006:0012:0018:0024:00

IST (Mumbai)

Tokyo

Overlap (4.5h)

Best call times between these locations

A 4.5-hour shared window is available every working day. Best 3 options listed — see time table for full detail.

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

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

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

Working hours defined as 09:00–17:00 local time for each location.

Holidays affecting scheduling

IST (Mumbai)

No upcoming public holidays this year.

Tokyo11 holidays

Apr 29Shōwa DaySOON

May 4Constitution Memorial DaySOON

May 4Greenery DaySOON

May 5Children's DaySOON

Jul 20Marine Day

How to work with IST (Mumbai) and Tokyo time zones

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

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If you are in IST (Mumbai), aim for 09:00–10:00, which corresponds to 12:00–13:00 in Tokyo — both teams are within working hours.

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If you are in IST (Mumbai), aim for 10:00–11:00, which corresponds to 13:00–14:00 in Tokyo — both teams are within working hours.

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If you are in IST (Mumbai), aim for 11:00–12:00, which corresponds to 14:00–15:00 in Tokyo — both teams are within working hours.

Recurring meetings are particularly vulnerable to DST shifts.

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