Question

Q. what do you mean by IST?​

Answer 1

Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time (DST) or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").

Answer 2

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INDIAN STANDARD TIME (IST)

it is the time observed throughout the india. In India, many longitudes pass. Therefore, the standard time for each country is usually taken as the time of the central meridian that passes through it. In India 82 ½ °E longitude determines the standard time. This is known as the Indian Standard Time.