[Solved]-Highcharts plotBands do not work with setExtremes function-Highcharts

To set extremes I advice using min and max for axis. That's why this exists, see: http://jsfiddle.net/J8jKQ/3/

Second issue is that your dates are Date objects, while should be timestamps:

myStartDate.getTime();
myEndDate.getTime();

And example: http://jsfiddle.net/J8jKQ/4/