The Alerts are determined by atomic clocks and synchronised While using the worldwide process of clocks that help Coordinated Universal Time. India's time zone relies to the 82.5°E meridian, which passes by means of Mirzapur. The half-hour offset was picked to help keep the time near to the mean solar https://ist-world-clock32448.wikijm.com/2408950/current_ist_time_no_further_a_mystery