Excel convert date to text retaining date layout

I have rows containing every Monday and Sunday in an entire year, (with variations on when a month starts and ends) like so,

11/05/2015  18/05/2015  25/05/2015  01/06/2015  08/06/2015
17/05/2015  24/05/2015  31/05/2015  07/06/2015  14/06/2015

However these are in the date format, and I need them in a text format, but so they still read in the dd/mm/yyyy format, not like 42125.

Further up my document, each column header should read dd/mm/yyyy-dd/mm/yyyy using each of the dates shown in my first example, and I was hoping to achieve this using the formula =A30&"-"&A31 and so on. So the desired outcome should read,

11/05/2015-17/05/2015   18/05/2015-24/05/2015

      11/05/2015            18/05/2015
      17/05/2015            24/05/2015

However using the =cell&cell formula im left with

42135-42141 42142-42148

11/05/2015  18/05/2015
17/05/2015  24/05/2015

I have to create these headings for 2 years worth of dates, and trying to avoid typing every heading out manually, is there a way to achieve this?