If you call package.getDetails you get back an empty build_date even if the package has one: <member> <name>package_build_date</name> <value> <string> </string> </value> </member>
Hibernate mapping for the build_time column was missing entirely. Sending code/src/com/redhat/rhn/domain/rhnpackage/Package_satellite.hbm.xml Sending code/src/com/redhat/rhn/domain/rhnpackage/test/PackageTest.java Sending code/src/com/redhat/rhn/frontend/xmlrpc/packages/PackageHelper.java Transmitting file data ... Committed revision 133249.
Verified.
API call Enhancements for 5.1 Sat GA so Closed for Current Release.