The Alerts are based upon atomic clocks and synchronised Using the worldwide system of clocks that assistance Coordinated Common Time. India's time zone is predicated on the 82.five°E meridian, which passes via Mirzapur. The 50 percent-hour offset was preferred to help keep the time close to the suggest solar time https://ist-world-clock43316.scrappingwiki.com/2467562/rumored_buzz_on_ist_to_gmt