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

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

TOKYO to IST Time Converter

TOKYO (Tokyo) → India Standard Time

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

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

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

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

IST (Mumbai)

India · -3.5h

05:30

London

United Kingdom · -8h

01:00

New York

USA · -13h

20:00-1 day

Dubai

United Arab Emirates · -5h

04:00

Sydney

Australia · +1h

10:00

Tokyo ↔ IST (Mumbai) — time offset

Tokyo is 3 hours 30 minutes ahead of IST (Mumbai). Midday in Tokyo lines up with 08:00 in IST (Mumbai).

Tokyo observes Asia/Tokyo and IST (Mumbai) observes Asia/Kolkata — a 3.5 hours 30 minutes gap between them.

Mutual working hours

There is a 4.5-hour window each day where both Tokyo and IST (Mumbai) are within standard business hours (09:00–17:00).

00:0006:0012:0018:0024:00

Tokyo

IST (Mumbai)

Overlap (4.5h)

Optimal meeting slots

Tokyo and IST (Mumbai) share 4.5 hours of business hours overlap daily. Showing the 3 most balanced slots — see the time table below for the full window.

13:00 Tokyo / 09:00 Mumbai✓ Both working

14:00 Tokyo / 10:00 Mumbai✓ Both working

15:00 Tokyo / 11:00 Mumbai✓ Both working

Assumes a standard 9 AM–5 PM workday in each location's local timezone.

Upcoming public holidays

Tokyo7 holidays

Jul 20Marine DaySOON

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

IST (Mumbai)

No upcoming public holidays this year.

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

Coordinating between Tokyo (Japan) and IST (Mumbai) (India) means working around a 3.5-hour time difference. The 4.5-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.

💡 How to schedule across these time zones

✅

Schedule at 13:00–14:00 (Tokyo) for a 09:00–10:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 14:00–15:00 (Tokyo) for a 10:00–11:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 15:00–16:00 (Tokyo) for a 11:00–12:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.

Install ClockinSync Free →

Drag the slider at the top to convert any Tokyo time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.

TOKYO (Tokyo) ↔ IST (Mumbai)

4h of business hours overlap daily (09:00–17:00)

TOKYO (Tokyo)

IST (Mumbai)