column.type = 'Date'

[cmpolis]

var dateFormat = d3.time.format("%Y-%m-%d");

// column defenition
{
  label: 'Birthday',
  type: 'date',
  accessor: function(row) { return row.birthday },
  dateParser: dateForamt.parse,
  format: dateFormat
}

[timelyportfolio]

Just in case you copy/paste into the real code

dateParser: dateForamt.parse,

should be

dateParser: dateFormat.parse,

:)