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

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

UTC to IST Time Converter

Coordinated Universal Time → India Standard Time

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

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

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

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

IST (Mumbai)

India · +4.5h

13:30

New York

USA · -5h

04:00

Tokyo

Japan · +8h

17:00

Dubai

United Arab Emirates · +3h

12:00

Sydney

Australia · +9h

18:00

How far apart are UTC (London) and IST (Mumbai)?

UTC (London) is 6 hours 30 minutes behind IST (Mumbai). Midday in UTC (London) lines up with 17:00 in IST (Mumbai).

UTC (London) observes Europe/London and IST (Mumbai) observes Asia/Kolkata — a 5.5 hours 30 minutes gap between them.

Daily overlap window

There is a 2.5-hour window each day where both UTC (London) and IST (Mumbai) are within standard business hours (09:00–17:00).

00:0006:0012:0018:0024:00

UTC (London)

IST (Mumbai)

Overlap (2.5h)

Optimal meeting slots

UTC (London) and IST (Mumbai) share 2.5 hours of business hours overlap daily.

09:00 London / 14:00 Mumbai✓ Both working

10:00 London / 15:00 Mumbai✓ Both working

11:00 London / 16:00 Mumbai✓ Both working

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

How to work with UTC (London) and IST (Mumbai) time zones

Coordinating between UTC (London) (United Kingdom) and IST (Mumbai) (India) means working around a 5.5-hour time difference. The 2.5-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 09:00–10:00 (UTC (London)) for a 14:00–15:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 10:00–11:00 (UTC (London)) for a 15:00–16:00 slot in IST (Mumbai) — the sweet spot where both teams are working.

✅

Schedule at 11:00–12:00 (UTC (London)) for a 16:00–17:00 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 UTC (London) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.

UTC (London) ↔ IST (Mumbai)

3h of business hours overlap daily (09:00–17:00)

UTC (London)

IST (Mumbai)

00:00

05:30

01:00

06:30

02:00

07:30

03:00

08:30

04:00

09:30Working

05:00

10:30Working

06:00

11:30Working

07:00

12:30Working

08:00

13:30Working

09:00Working

14:30Working

10:00Working

15:30Working

11:00Working

16:30Working

12:00Working

17:30off

13:00Working

18:30off

14:00Working

19:30off

15:00Working

20:30off

16:00Working

21:30off

17:00

22:30

18:00

23:30

19:00

00:30+1d

20:00

01:30+1d

21:00

02:30+1d

22:00

03:30+1d

23:00

04:30+1d

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

Frequently Asked Questions

What is the difference between utc and ist?

Coordinated Universal Time (utc) is UTC+0 and India Standard Time (ist) is UTC+5:30. The difference between them is 5.5 hours.

Where is utc used?

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

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.

How do I convert utc to ist?

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

Popular UTC conversions

UTC → New York UTC → Tokyo UTC → Dubai UTC → Sydney UTC → Paris UTC → Berlin UTC → Singapore UTC → Los Angeles UTC → Toronto UTC → Mumbai

Popular IST conversions

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