Date slider doesn't reset properly

[econpy]

When you move the RHS of the date slider to the left (i.e. reduce the max date) and then return the slider all the way to the right again, the date displayed is a date less than the proper max date. Only the date displayed under the slider is affected as the data displayed in the chart has the proper range. The Javascript causing this issue is somewhere in the static/js/a.js file.