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Kolkata, in eastern India, has a population of roughly 4.6 million within its core. The Asia/Kolkata time zone that carries India's national standard takes its very name from the city; the offset is UTC+5:30, applied nationwide without daylight saving, so local clocks stay five and a half hours ahead of Coordinated Universal Time. Kolkata sits on the Hooghly river near 22.6°N, 88.4°E. As the capital of West Bengal, it is one of the principal metropolitan centres of the Indian east.