Currently, the CHANGES... tokens don't allow customizing the date format. This produces weird looking ISO-8601(ish) dates with fractional seconds (at least with Subversion plugin).

Please allow customizing date formats for these tokens.

On a related note, the source code for ChangesSinceLastBuildContent does not explain why it uses unreliable-looking reflection and the getDate() function, when there's getTimestamp defined in core.