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Each time zone  has a one hour difference between the time zones that it borders.  The Eastern Standard Time (EST) zone borders the Central Standard  Time (CST) zone on the east, therefore, 12:00PM CST would equal  1:00AM EST. 3 people found this useful. Answered.
However, before calculating the difference we should first get to know what CST and IST stand for. CST is Central Standard Time observed in North America and Central America while IST stands for India Standard Time that is observed across whole of India. While IST is 5:30 hours ahead of GMT, CST is 6 hours behind GMT.