Creating Custom Date range

[sieed]

I am trying to create a custom date range that shows the last fifteen days no matter if there is data for that date in  my table or not. As long as it's in the last 15 days range, it should be shown on the graph. Here's my current graph: 



As you can see, it is not showing the last 15 days because I don't have any data pripr to March 1st. However, I need to display the last 15 day. I tried creatin a calculated column called Last15Days = toda() - date. However, this only displays dates which are in my data. So, for instance, Feb29th is not displayed although its in the last 15 days range. 

[rocky09 · Accepted solution]