The Signals are according to atomic clocks and synchronised With all the worldwide procedure of clocks that assist Coordinated Universal Time. India's time zone is based around the eighty two.five°E meridian, which passes through Mirzapur. The 50 %-hour offset was selected to help keep the time near to the mean https://pst-to-ist14573.wikibuysell.com/2490531/ist_time_fundamentals_explained