ISAFTER, ISONORAFTER – DAX Guide

ISAFTER: Returns true if the list of Value1 parameters compares strictly after the list of Value2 parameters.
https://dax.guide/isafter/

ISONORAFTER: The IsOnOrAfter function is a boolean function that emulates the behavior of Start At clause and returns true for a row that meets all the conditions mentioned as parameters in this function.
https://dax.guide/isonorafter/

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