By default, the date variables in the Report Designer are formatted as Month D, YYYY (e.g., January 1, 2015), but you can do the following to change the date format.
Select
File
then
Report Designer
.
Expand one of the Report folders from the Reports list and double-click a report to open it in the design grid.
Select the cell that contains the date variable.
Select
Format
,
Cells
, then the
Format
tab.
Select
Date & Time
from the Category list, then select the date format to apply from the Type list.