where does the standard meridian of india pass through
Indian Standard Time After independence in 1947, the Indian government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively.[3] The Central observatory was moved from Chennai to a location at Shankargarh Fort Allahabad district, so that it would be as close to UTC +5:30 as possible.