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Convert EST to IST Coordinating between North America and India? This EST to IST converter handles the 10 .5 or 9.5 hour difference for you. Whether it’s Eastern Standard or Eastern Daylight Time, the tool shifts the clock and adjusts the date automatically. Here’s a clear look at which countries use each time zone: Quickly convert India Standard Time ( IST ) to Eastern Standard Time ( EST ) with this easy-to-use, modern time zone converter. When it’s 10:00 AM EST (morning), it’s 8:30 PM IST (night). This follows the standard 10.5-hour difference between these time zones, where IST is 10.5 hours ahead of EST. When it's 10 AM in New York ( EST ), it's already 8:30 PM in India ( IST ). During Daylight Saving Time (EDT), the Eastern Time zone shifts to UTC-4, making the difference with IST 9.5 hours instead of 10.5 hours. India does not observe Daylight Saving Time, so IST remains constant throughout the year.