Serial Chart - Multiple grouped date fields

[jessneuner]

We'd like to be able to show on the same chart the number of new reports and number of closed reports by month - ideally with the source data. 

Right now - it seems like we have to create two charts, which can be difficult to understand whether the new and closed are keeping up with each other or are we getting behind month to month or week to week. 

It'd be awesome to have an option to do a date based chart with multiple date fields contributing to multiple series.