var today = new Date(),
    day = 1000 * 60 * 60 * 24;

// Set to 00:00:00:000 today
today.setUTCHours(0);
today.setUTCMinutes(0);
today.setUTCSeconds(0);
today.setUTCMilliseconds(0);


// THE CHART
Highcharts.ganttChart('container', {
    title: {
        text: 'Highcharts Gantt With Subtasks'
    },
    xAxis: {
        min: today.getTime() - (2 * day),
        max: today.getTime() + (32 * day)
    },
    accessibility: {
        keyboardNavigation: {
            seriesNavigation: {
                mode: 'serialize'
            }
        },
        point: {
            descriptionFormatter: function (point) {
                var dependency = point.dependency &&
                        point.series.chart.get(point.dependency).name,
                    dependsOn = dependency ? ' Depends on ' + dependency + '.' : '';

                return Highcharts.format(
                    '{point.yCategory}. Start {point.x:%Y-%m-%d}, end {point.x2:%Y-%m-%d}.{dependsOn}',
                    { point, dependsOn }
                );
            }
        }
    },
    lang: {
        accessibility: {
            axis: {
                xAxisDescriptionPlural: 'The chart has a two-part X axis showing time in both week numbers and days.'
            }
        }
    },
    series: [{
        name: 'Project 1',
        data: [{
            name: 'Planning',
            id: 'planning',
            start: today.getTime(),
            end: today.getTime() + (20 * day)
        }, {
            name: 'Requirements',
            id: 'requirements',
            parent: 'planning',
            start: today.getTime(),
            end: today.getTime() + (5 * day)
        }, {
            name: 'Design',
            id: 'design',
            dependency: 'requirements',
            parent: 'planning',
            start: today.getTime() + (3 * day),
            end: today.getTime() + (20 * day)
        }, {
            name: 'Layout',
            id: 'layout',
            parent: 'design',
            start: today.getTime() + (3 * day),
            end: today.getTime() + (10 * day)
        }, {
            name: 'Graphics',
            parent: 'design',
            dependency: 'layout',
            start: today.getTime() + (10 * day),
            end: today.getTime() + (20 * day)
        }, {
            name: 'Develop',
            id: 'develop',
            start: today.getTime() + (5 * day),
            end: today.getTime() + (30 * day)
        }, {
            name: 'Create unit tests',
            id: 'unit_tests',
            dependency: 'requirements',
            parent: 'develop',
            start: today.getTime() + (5 * day),
            end: today.getTime() + (8 * day)
        }, {
            name: 'Implement',
            id: 'implement',
            dependency: 'unit_tests',
            parent: 'develop',
            start: today.getTime() + (8 * day),
            end: today.getTime() + (30 * day)
        }]
    }]
});