Control and Cumulative Flow Diagram Charts do not work when you have "-" in the date format

Steps to reproduce

1. Configure your Look and Feel to separate the date with "-";
   • i.e: yyyy-MM-dd
2. Replicate this configuration in the Advanced Configuration (inside the General Configuration menu);
3. Browse to one Agile board and click on the "Reports" tab;
4. Choose either "Control" or "Cumulative Flow Diagram" chart;
5. Click In the date field (in the upper left corner), and then choose "Custom";
6. Try to modify the date there;
7. You will receive the error "From date required";

Current behaviour

You are unable to use the "Custom" option from these charts while using this date format because of the "-".

Expected behaviour

Since that using "-" in the date format is supported, we should guarantee that these charts work with this date type as well;

Workaround

Use a different date type or if you want to continue on using this date format, just switch from "-" to "/" between the dates.

i.e: From yyyy-MM-dd to yyyy/MM/dd