jQuery.fn.dataTableExt.oSort['iso-date-asc'] = function ( a, b ) {
  a = $(".post-date", a).text();
  b = $(".post-date", b).text();

  var x = new Date().setISO8601(a);
  var y = new Date().setISO8601(b);

  if ( isNaN(x) || x==="" )
  {
    x = Date.parse( "01/01/1970 00:00:00" );
  }
  if ( isNaN(y) || y==="" )
  {
    y =	Date.parse( "01/01/1970 00:00:00" );
  }

  return x - y;
};

jQuery.fn.dataTableExt.oSort['iso-date-desc'] = function ( a, b ) {
  a = $(".post-date", a).text();
  b = $(".post-date", b).text();

  var x = new Date().setISO8601(a);
  var y = new Date().setISO8601(b);

  if ( isNaN(x) || x==="" )
  {
    x = Date.parse( "01/01/1970 00:00:00" );
  }
  if ( isNaN(y) || y==="" )
  {
    y =	Date.parse( "01/01/1970 00:00:00" );
  }

  return y - x;
}

// http://dansnetwork.com/javascript-iso8601rfc3339-date-parser/
Date.prototype.setISO8601 = function(dString) {

  var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;

  if (dString.toString().match(new RegExp(regexp))) {
    var d = dString.match(new RegExp(regexp));
    var offset = 0;

    this.setUTCDate(1);
    this.setUTCFullYear(parseInt(d[1],10));
    this.setUTCMonth(parseInt(d[3],10) - 1);
    this.setUTCDate(parseInt(d[5],10));
    this.setUTCHours(parseInt(d[7],10));
    this.setUTCMinutes(parseInt(d[9],10));
    this.setUTCSeconds(parseInt(d[11],10));
    if (d[12])
      this.setUTCMilliseconds(parseFloat(d[12]) * 1000);
    else
      this.setUTCMilliseconds(0);
    if (d[13] != 'Z') {
      offset = (d[15] * 60) + parseInt(d[17],10);
      offset *= ((d[14] == '-') ? -1 : 1);
      this.setTime(this.getTime() - offset * 60 * 1000);
    }
  } else {
    this.setTime(Date.parse(dString));
  }
  return this;
};