India Standard Time (Kolkata)

India Standard Time (IST) is UTC+5:30, one of the world's half-hour offset time zones. Despite India's vast east-west span (covering about 30° of longitude), the entire country uses a single timezone. This was established during British colonial rule and maintained after independence in 1947 for national unity. The half-hour offset means IST does not align neatly with neighboring time zones — it is 30 minutes ahead of Pakistan (UTC+5) and 30 minutes behind Myanmar (UTC+6:30). India has debated creating two time zones (IST-I and IST-II) to address the early darkness in northeastern states like Assam, but no change has been implemented. India does not observe DST. The Mumbai Stock Exchange (BSE) and National Stock Exchange (NSE) are among Asia's largest and operate on IST. India's IT industry — centered in Bangalore, Hyderabad, Pune, and Chennai — is the world's largest IT outsourcing market, and the IST timezone creates a roughly 10-12 hour offset from US time zones that enables '24-hour sun' development cycles. Kolkata, the timezone's reference city in the IANA database, was chosen because India's official timezone meridian passes through it.