8 How do I display "Showing content between date1 and date2" on the current pager item?
There is an other way for "Showing content between date1 and date2" use the Exposed filters  fields for the "Start date" and "End date" with Is between Operator. According to field created in the content type, From this You can easily filter the content according your filled date and set displayed items in pager.
Hope its helpful to you!