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Early finish date â adding duration to the early start date. Latest start date. Latest finish date â adding duration to latest start date. Slack time â difference between latest start date and early start date or between latest finish date and early finish date.
Let's see how to calculate the difference between the start date and end date columns. For that we need to define a calculated column. 1  Select Calculated Column as type of the field. 2  We will use the date difference function, DATEDIF, with start date and end date to get number of years.