Format the date
In addition to the standard cell formatting choices available through Excel’s Format > Cells (Ctrl+1) feature, you can apply limited formatting to cell ranges with Report Builder. These formatting choices depend on the metric you have chosen.
After you add dimensions to the Row Labels grid, click Format.
In the Format menu, click Custom Format to apply customized formats for dates similar to the prepend and postpend feature. For example, you can enter text that always occurs after the date (such as A.D. B.C.E. A.H. etc.). You can add text before the date, such as Start Date and Start and End Date. In addition, you can construct a custom date expression from day, month, and year abbreviations, and use a custom separator between parts of the date. All date formats must consist of three abbreviations only enclosed in brackets.
The following table describes how you can use date abbreviations in the Custom Format field: