Am trying to plot spline graph for the no of passed/failed testcases and grouping them based on hour/date/month/year and I am getting this value as irr
Try the following, setting ordinal false fixes the time intervals and not changed for best visualization.
xAxis: { type: 'datetime', minTickInterval: 3600*24*30*1000,//time in milliseconds minRange: 3600*24*30*1000, ordinal: false //this sets the fixed time formats },