The Signals are according to atomic clocks and synchronised Together with the worldwide system of clocks that aid Coordinated Common Time. India's time zone is predicated to the 82.5°E meridian, which passes via Mirzapur. The 50 %-hour offset was selected to keep the time near the indicate photo voltaic time https://est-to-ist83992.wiki-jp.com/2420565/the_ultimate_guide_to_est_to_ist