Mumbai uses the Asia/Kolkata time zone, with IST (UTC +5:30) during standard time.
Asia/Kolkata
IST
IST
UTC +5:30
Not Observed
Year-round standard time
No DST change
Standard time year-round
Mumbai (Bombay) runs on IST like the rest of India (UTC+5:30, no DST). Mumbai is India's financial capital — the BSE (Bombay Stock Exchange) and NSE (National Stock Exchange) both anchor here. Trading hours 9:15 AM - 3:30 PM IST. The city's business culture skews slightly later than Delhi or Bengaluru — 10 AM office starts are common, with equity traders and derivatives desks operating in the pre-market.
South Asia (India, Pakistan, Bangladesh, Sri Lanka, Nepal, Bhutan) runs on a small set of tightly-clustered timezones — most of the region is between UTC+5 and UTC+6, with India's IST (UTC+5:30) being the reference clock. None of the major economies observe DST, so offsets stay fixed year-round. The overlap window with both Europe and the US East Coast is compressed but usable — why so many global support / BPO operations base delivery here.
Local Exchange
India's two largest exchanges, both headquartered in Mumbai. The BSE (founded 1875) is Asia's oldest stock exchange.
These cities share the same time zone as Mumbai.
Major cities in India — some may be in a different time zone.
Find when business hours overlap between your timezone and Mumbai.
Find Best Calling TimeMumbai time, timezone, and scheduling
