=> Use For Each row in Datatable to iterate through dtInput and use below syntaxes in assign activitiy:
MfgDate= DateTime.ParseExact(CurrentRow("Mfg Date").ToString,{"MM/yyyy","MM/yy"},System.Globalization.CultureInfo.InvariantCulture,DateTimeStyles.None)
ExpDate= DateTime.ParseExact(CurrentRow("Exp Date").ToString,{"MM/yyyy","MM/yy"},System.Globalization.CultureInfo.InvariantCulture,DateTimeStyles.None)
StartDate= New DateTime(MfgDate.Year,MfgDate.Month,1).ToString("dd/MM/yyyy")
EndDate= New DateTime(ExpDate.Year,ExpDate.Month,1).AddDays(-1).ToString("dd/MM/yyyy")
Note: MfgDate and ExpDate are of DataType System.DateTime and StartDate and EndDate is of DataType System.String
=> Use Add dataRow acitivty and in ArrayRow pass the below syntax: