Multiple choice Indian Standard Time (IST) is measured at _____. Jaipur Allahabad Mumbai Delhi Reveal answer Fill a bubble to check yourself B Correct answer Explanation Indian Standard Time (IST) is calculated from 82.5° E longitude, which passes near Allahabad (now Prayagraj). This meridian was chosen because it runs almost exactly through the center of India, and the time zone is UTC+5:30.