Just played around with this some more. If I upload a CSV with a date in the format such as “June 19, 2010” as shown below, and do not specify that the attribute type as date in CODAP, I can make a graph that displays the date properly. Also, I can sort the data in chronological order and then add connecting lines that appear properly to a graph with date on the X axis and another attribute on the Y axis, all without specifying date data type for the date attribute (see second image below). So there are workarounds, it seems.
