The Indicators are based upon atomic clocks and synchronised Together with the worldwide system of clocks that support Coordinated Universal Time. India's time zone relies to the 82.5°E meridian, which passes through Mirzapur. The half-hour offset was picked out to help keep the time near the imply solar time across https://ist-world-clock32448.wikijm.com/2408950/current_ist_time_no_further_a_mystery