All matches have their dates/details here:

http://www.fcbarcelona.com/football/first-team/calendar





Fifa dates:

2014
01-09 September- Official or Friendly Matches
06-14 October - Official or Friendly Matches
10-18 November - Official or Friendly Matches

2015
17 January - 07 February - Africa Cup of Nations 2015
23-31 March - Official or Friendly Matches
08-16 June - Official or Friendly Matches
11 June - 04 July - Copa America 2015
07-26 July - CONCACAF Gold Cup 2015