Add date range option

Ill try to look into getting this in the view.

I've created a patch that adds the date filtering, I only tested this on a environment that doesn't really use webform_analysis, but non the less it seems to be working there. I only didn't get to use the charts. If anyone could test it further, much appreciated.

I tested this. With this new options I am able to filter submissions in the webform analysis.

Automatically closed - issue fixed for 2 weeks with no activity.