I also noticed that new timestamp format seems to ignore the NLS settings (logs in 3.2 used dd.mm.yy, 4.0 uses mm/dd/yy), and sorting by timestamp behaves weirdly, mixing up the entries.
A timestamp found inside one of my older "history.xml" files looks like this:
<timestamp><![CDATA[12/11/13 2:18 PM]]></timestamp>
A newer one looks like this:
It would probably give Xquery fits reconciling the different formats, sorting, eliminating older SQLs in the history according to one's preferences inside SQL Developer 4, etc.
I'm going back to the last early adopter release just to preserve history and sequence until the tool makers resolve the timestamp and the weird sort order problem.
The tool makers have ID the issue and are fixing it for our next update.
Jeff, Thank you for reporting back to the thread. I'm glad that there's a fix in the works. I had to use a bit of sed and awk to transform my 2 weeks of SqlHistory *.xml files back to the former timestamp format and restore my SQL Developer 4 EA 3 environment to maintain continuity (and context).
The issue is fixed now for me on
Mac OS/X 10.8.5
Oracle IDE 184.108.40.206.48