Reassigning.

I cannot remember hearing any other requests for something like this (usually you just care about the duration of a
build), and we generally prefer to reduce noise in the console output where possible. If you want this you can write it
as an independent module, publish it on plugins.netbeans.org, and see if others like it:

http://bits.netbeans.org/dev/javadoc/org-apache-tools-ant-module/org/apache/tools/ant/module/spi/AntLogger.html

It's going to be something like this:

@ServiceProvider(service=AntLogger.class, position=101)
public class BuildTimeDisplayer extends AntLogger {
  public @Override interestedInSession(Session s) {return true;}
  public @Override buildFinished(AntEvent e) {e.getSession().println(new Date(), true, null);}
}