Formatting Dates with YYYY-MM

 /* data stolen from http://howmanyleft.co.uk/vehicle/jaguar_'e'_type */ var month_data = [ {"period": "2012-10", "licensed": 3407, "sorned": 660}, {"period": "2011-08", "licensed": 3351, "sorned": 629}, {"period": "2011-03", "licensed": 3269, "sorned": 618}, {"period": "2010-08", "licensed": 3246, "sorned": 661}, {"period": "2010-05", "licensed": 3257, "sorned": 667}, {"period": "2010-03", "licensed": 3248, "sorned": 627}, {"period": "2010-01", "licensed": 3171, "sorned": 660}, {"period": "2009-12", "licensed": 3171, "sorned": 676}, {"period": "2009-10", "licensed": 3201, "sorned": 656}, {"period": "2009-09", "licensed": 3215, "sorned": 622} ]; Morris.Line({ element: 'graph', data: month_data, xkey: 'period', ykeys: ['licensed', 'sorned'], labels: ['Licensed', 'SORN'], smooth: false });