When you create a group on a Date field in Crystal, you have the option to group "for each week", "for each day", etc. Check this option on the Group to make sure that the appropriate selection is made.
  1. Go to Report > Group Expert
  2. Select the Date group from the list on the left
  3. Click Options
  4. Change the drop down labeled "this section will be printed..." to the correct selection
  5. Click OK
  6. Click OK on the Group Expert
  7. Refresh the report