The Alerts are depending on atomic clocks and synchronised Using the worldwide system of clocks that aid Coordinated Universal Time. India's time zone is based on the 82.five°E meridian, which passes via Mirzapur. The 50 %-hour offset was picked to maintain the time near to the imply photo voltaic time https://isttime33648.wikiannouncement.com/10622141/the_gmt_to_ist_diaries