Add Album.date attribute

docs/changes.rst

@@ -67,6 +67,9 @@ backends:
   it completed the calibration first, and then quit, which could take more than
   15 seconds.
 
+- Added :attr:`mopidy.models.Album.date` attribute. It has the same format as
+  the existing :attr:`mopidy.models.Track.date`.
+
 **Bug fixes**
 
 - :issue:`213`: Fix "streaming task paused, reason not-negotiated" errors

mopidy/models.py

@@ -120,6 +120,8 @@ class Album(ImmutableObject):
     :type artists: list of :class:`Artist`
     :param num_tracks: number of tracks in album
     :type num_tracks: integer
+    :param date: album release date (YYYY or YYYY-MM-DD)
+    :type date: string
     :param musicbrainz_id: MusicBrainz ID
     :type musicbrainz_id: string
     """
@@ -136,6 +138,9 @@ class Album(ImmutableObject):
     #: The number of tracks in the album. Read-only.
     num_tracks = 0
 
+    #: The album release date. Read-only.
+    date = None
+
     #: The MusicBrainz ID of the album. Read-only.
     musicbrainz_id = None