In order to control content and report appearance, Expressions are frequently used in Reporting Services paginated reports. Expressions can use built-in functions, custom code, report, group variables, and user-defined variables.
DateAdd: This function is basically used for supplying a range of dates based on a single parameter. The following expression provides a date that is three months after the date from a parameter named StartDate.
Syntax: =DateAdd(DateInterval.Month, 3, Parameters!StartDate.Value)
Go to Expression editor, under the Common Functions in the Category window, check Date & Time functions. We cam make use of DateAdd() function.
=DateAdd("d", 15, Fields!payment_date)
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