Was getting crashes, of all things, on my call to wxDateTime::Format. The problem turned out to be that where I should have used %S for seconds, I had used %s. This should not be a compiles-fine-but-crashes issue!!!
Making lemonade after lemons, here are a couple of nice pages that I found along the way to figuring this out:
The most examples ever for wxDateTime::Format on a single web page:
http://forums.codeblocks.org/index.php?topic=1587.0
The "Hello World" example in the following verified that when I was building my file name for the dialog box I was using %s correctly:
http://biolpc22.york.ac.uk/wx/docs/html/wx/wx_wxstringoverview.html
However, I was possibly using a wxString incorrectly instead of wxString.c_str() for the source of my %s.
Here is the big table of all the time formatting controls:
http://www.cplusplus.com/reference/clibrary/ctime/strftime/
Here are a few doc pages for the wxWidgets time classes, which are very interesting and full-featured:
http://docs.wxwidgets.org/2.9/overview_datetime.html
http://docs.wxwidgets.org/2.9/classwx_date_time.html
The wxWiki page of file dialogs for babies:
http://wiki.wxwidgets.org/Writing_Your_First_Application-Common_Dialogs
The docs page for file dialogs, for which the examples are pretty weak:
http://docs.wxwidgets.org/trunk/classwx_file_dialog.html