Title INDIAN STANDARD TIME (IST) Date-wise Events January 01, 1906:   IST, with a time offset of UTC +05:30 was officially adopted on this day. Description (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. India does not observe Daylight Saving Time (DST) or other seasonal adjustments. It is calculated on the basis of 82.5° E longitude, in Shankargarh Fort (25.15°N 82.58°E) (in Allahabad). It was officially adopted on January 01, 1906 by the British India.

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