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

Coordinated Universal Time (utc) is used in United Kingdom. The IANA timezone identifier is UTC.

IST to UTC Time Converter

India Standard Time → Coordinated Universal Time

IST = UTC+5:30UTC = UTC+0

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

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

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

UTC (London)

United Kingdom · -4.5h

04:30

New York

USA · -9.5h

23:30-1 day

Tokyo

Japan · +3.5h

12:30

Dubai

United Arab Emirates · -1.5h

07:30

Sydney

Australia · +4.5h

13:30

IST (Mumbai) vs UTC (London) — time difference

IST (Mumbai) is 5 hours 30 minutes ahead of UTC (London). When IST (Mumbai) clocks hit noon, UTC (London) reads 06:00.

IST (Mumbai) is in the Asia/Kolkata timezone. UTC (London) is in Europe/London. The difference is 5.5 hours 30 minutes.

Shared working hours

Every working day, IST (Mumbai) and UTC (London) are both in business hours for 2.5 hours simultaneously.

00:0006:0012:0018:0024:00

IST (Mumbai)

UTC (London)

Overlap (2.5h)

When to schedule across time zones

Both IST (Mumbai) and UTC (London) are in standard hours simultaneously for 2.5h per day.

15:00 Mumbai / 09:00 London✓ Both working

16:00 Mumbai / 10:00 London✓ Both working

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

Working across IST (Mumbai) and UTC (London)

Working across IST (Mumbai) (India) and UTC (London) (United Kingdom) involves a 5.5-hour gap. The good news: there is a 2.5-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

✅

15:00–16:00 in IST (Mumbai) = 09:00–10:00 in UTC (London). Both sides are in standard business hours during this window.

✅

16:00–17:00 in IST (Mumbai) = 10:00–11:00 in UTC (London). 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) ↔ UTC (London)

2h of business hours overlap daily (09:00–17:00)

IST (Mumbai)

UTC (London)