The Alerts are based upon atomic clocks and synchronised Using the worldwide program of clocks that assistance Coordinated Common Time. India's time zone is based to the 82.5°E meridian, which passes by Mirzapur. The 50 %-hour offset was picked out to keep the time close to the suggest solar time https://ist-time-now09872.sunderwiki.com/2420077/what_does_stopwatch_mean