=Fields!Year.Value & "-" & RIGHT("0" & Fields!Month_Number.Value,2)
2015-01
2015-02
2015-03
2015-04
2015-05
2015-06
2015-07
2015-08
2015-09
2015-10
2015-11
2015-12
=Switch(Fields!NameOfMonth.Value="January",1,Fields!NameOfMonth.Value="February",2,Fields!NameOfMonth.Value="March",3,Fields!NameOfMonth.Value="April",4,Fields!NameOfMonth.Value="May",5,Fields!NameOfMonth.Value="June",6,Fields!NameOfMonth.Value="July",7,Fields!NameOfMonth.Value="August",8,Fields!NameOfMonth.Value="September",9,Fields!NameOfMonth.Value="October",10,Fields!NameOfMonth.Value="November",11,Fields!NameOfMonth.Value="December",12)
您可以使用上述表达式进行日期部分和排序 按月排序