The Alerts are depending on atomic clocks and synchronised Along with the worldwide technique of clocks that support Coordinated Common Time. India's time zone is based over the 82.5°E meridian, which passes by Mirzapur. The 50 %-hour offset was selected to help keep the time near the suggest solar time https://liveworldclock12991.wikipresses.com/7700596/indicators_on_ist_to_gmt_you_should_know