[
            {
                id: 1,
                enabled: false,
                layer: 'Mood',
                color: '#f16c63',
                points: [
                    {date: '2013-01-02', value: 20},
                    {date: '2013-02-02', value: 15},
                    {date: '2013-03-12', value: 24},
                    {date: '2013-03-23', value: 18},
                    {date: '2013-03-24', value: 22},
                    {date: '2013-04-09', value: 12},
                    {date: '2013-06-13', value: 16},
                    {date: '2013-06-14', value: 20},
                ]
            },
            {
                id: 2,
                enabled: true,
                layer: 'Performance',
                color: '#698bfc',
                points: [
                    {date: '2013-01-02', value: 15},
                    {date: '2013-02-02', value: 24},
                    {date: '2013-03-12', value: 29},
                    {date: '2013-03-23', value: 21},
                    {date: '2013-03-24', value: 20},
                    {date: '2013-04-09', value: 17},
                    {date: '2013-06-13', value: 25},
                    {date: '2013-06-14', value: 21},
                ]
            },
            {
                id: 3,
                enabled: false,
                layer: 'Fatigue',
                color: '#e1fc6a',
                points: [
                    {date: '2013-01-02', value: 32},
                    {date: '2013-02-02', value: 27},
                    {date: '2013-03-12', value: 30},
                    {date: '2013-03-23', value: 31},
                    {date: '2013-03-24', value: 27},
                    {date: '2013-04-09', value: 15},
                    {date: '2013-06-13', value: 20},
                    {date: '2013-06-14', value: 18},
                ]
            },
            {
                id: 4,
                enabled: true,
                layer: 'Hunger',
                color: '#63adf1',
                points: [
                    {date: '2013-01-02', value: 12},
                    {date: '2013-02-02', value: 15},
                    {date: '2013-03-12', value: 13},
                    {date: '2013-03-23', value: 17},
                    {date: '2013-03-24', value: 10},
                    {date: '2013-04-09', value: 14},
                    {date: '2013-06-13', value: 12},
                    {date: '2013-06-14', value: 11},
                ]
            },
        ]

var maxDate = _.max(dataset, function (area) {
                   return _.max(area.points, function (point) {
                       console.log(new Date(point.date).getTime())
                       return new Date(point.date).getTime()
                   })

               });