The Signals are based on atomic clocks and synchronised Together with the worldwide method of clocks that assist Coordinated Universal Time. India's time zone is based within the 82.5°E meridian, which passes by means of Mirzapur. The half-hour offset was picked to maintain the time near the imply solar time https://currenttimeinindia49701.eveowiki.com/2492303/the_5_second_trick_for_live_world_clock