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