The Alerts are according to atomic clocks and synchronised Using the worldwide method of clocks that aid Coordinated Common Time. India's time zone is based to the eighty two.five°E meridian, which passes via Mirzapur. The fifty percent-hour offset was preferred to maintain the time close to the signify solar time https://live-ist-time81061.wikigiogio.com/2470547/helping_the_others_realize_the_advantages_of_current_ist_time