Japan Standard Time (jst) 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.

JST to IST Time Converter

Japan Standard Time → India Standard Time

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

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

JST → Ireland Standard Time (Dublin) ↗JST → 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

Time difference: JST (Tokyo) and IST (Mumbai)

JST (Tokyo) is 3 hours 30 minutes ahead of IST (Mumbai). At noon in JST (Tokyo), your contact in IST (Mumbai) sees 08:00.

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

Business hours comparison

JST (Tokyo) and IST (Mumbai) share 4.5 hours of overlapping business hours daily — enough for real-time collaboration without anyone joining at odd hours.

00:0006:0012:0018:0024:00

JST (Tokyo)

IST (Mumbai)

Overlap (4.5h)

Recommended meeting windows

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

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

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

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

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

Public holidays for both locations

JST (Tokyo)7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

IST (Mumbai)

No upcoming public holidays this year.

Scheduling between JST (Tokyo) and IST (Mumbai)

JST (Tokyo) (Japan) leads IST (Mumbai) (India) by 3.5 hours. Despite the gap, a 4.5-hour window of shared business hours each day keeps real-time collaboration practical for both sides.

💡 Scheduling tips for these locations

✅

13:00–14:00 in JST (Tokyo) = 09:00–10:00 in IST (Mumbai). Both sides are in standard business hours during this window.

✅

14:00–15:00 in JST (Tokyo) = 10:00–11:00 in IST (Mumbai). Both sides are in standard business hours during this window.

✅

15:00–16:00 in JST (Tokyo) = 11:00–12:00 in IST (Mumbai). 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 JST (Tokyo). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

JST (Tokyo) ↔ IST (Mumbai)

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

JST (Tokyo)

IST (Mumbai)