Select and order all subdocuments from a collection

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I have the following documents in a collection:

{
  "thread_object": "Sed consectetur, massa id aliquam lacinia",
  "thread_comments": [
    {
      "comment_date": "11/01/2014 17:23:19",
      "comment_user": "Integer",
      "comment_content": "In suscipit enim at eleifend auctor"
    },
    {
      "comment_date": "12/01/2014 17:23:19",
      "comment_user": "Suspendisse",
      "comment_content": "Quisque facilisis magna pellentesque diam mollis"
    }
  ]
},
{
  "thread_object": "Vivamus auctor mauris augue",
  "thread_comments": []
},
{
  "thread_object": "Phasellus volutpat, sem id convallis elementum",
  "thread_comments": [
    {
      "comment_date": "10/01/2014 17:23:19",
      "comment_user": "Donec",
      "comment_content": "Suspendisse a pellentesque justo"
    }
  ]
}

How can I retrieve an ordered list of all the comments?

{
  "comment_date": "10/01/2014 17:23:19",
  "comment_user": "Donec",
  "comment_content": "Suspendisse a pellentesque justo"
},
{
  "comment_date": "11/01/2014 17:23:19",
  "comment_user": "Integer",
  "comment_content": "In suscipit enim at eleifend auctor"
},
{
  "comment_date": "12/01/2014 17:23:19",
  "comment_user": "Suspendisse",
  "comment_content": "Quisque facilisis magna pellentesque diam mollis"
},

asked 36 secs ago

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