The Signals are based on atomic clocks and synchronised with the worldwide technique of clocks that support Coordinated Common Time. India's time zone is predicated around the eighty two.5°E meridian, which passes via Mirzapur. The 50 percent-hour offset was preferred to help keep the time near the imply solar time https://india-standard-time05012.cosmicwiki.com/2456490/the_definitive_guide_to_ist_time_now