What time zone is Mumbai in?

Mumbai uses India Standard Time (IST), which is UTC+5:30 — a unique half-hour offset shared across all of India.

Why does India use UTC+5:30 instead of a whole hour?

India's UTC+5:30 offset was chosen to better align with the country's geographic center, bridging UTC+5 and UTC+6 zones.

Does Mumbai observe Daylight Saving Time?

No. India has never observed DST. IST (UTC+5:30) is stable year-round for all 1.4 billion Indians.

What is the time difference between Mumbai and London?

Mumbai is 5 hours 30 minutes ahead of London (GMT) in winter, and 4 hours 30 minutes ahead during BST.

Mumbai Time Zone — IST UTC+5:30

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Mumbai

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Updates every second

GMT OffsetGMT+5:30

UTC OffsetUTC+5:30 (IST)

Difference from your clock: …

Time Zone Details

Time Zone

Asia/Kolkata

Continent

Asia

Country

India

Daylight Saving

No — stable year-round

India uses a single time zone (IST) nationwide and does not observe Daylight Saving Time.

Open Mumbai in Time Hub →

Sunrise & Sunset

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Sunrise

6:00 AM – 7:20 AM

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Sunset

5:55 PM – 7:20 PM

Approximate seasonal range. Exact times vary by date.

Seasons & Climate

Tropical monsoon climate. Summers very hot & humid ~32 °C (90 °F); monsoon season June–September with heavy rains; winters mild ~25 °C (77 °F).

Best Time to Visit

November–February

City Quick Facts

Population

12.5 million (city); ~20.7 million (metro)

Official Language

Hindi, Marathi, English widely spoken

Currency

INR (₹)

Calling Code

+91

Business Hours

Mon–Fri 9 AM – 6 PM IST (some Sat mornings)

Weekend

Saturday & Sunday

Time Zone Facts

India Standard Time (IST) is one of the world's unusual half-hour offsets: UTC+5:30, shared across 1.4 billion people.
India has a single time zone for the entire subcontinent — from Mumbai on the west coast to Kolkata on the east.
IST never changes: scheduling calls with Mumbai is simpler than with cities that observe DST.
The Bombay Stock Exchange (BSE) opens at 9:15 AM IST and is one of Asia's oldest exchanges.
Mumbai is exactly 9 hours 30 minutes ahead of New York (EST) in winter — a memorable, stable offset.