See the below phpdoc for cbFormatDate. You can completely override the format using it. The formatting supplied needs to be PHP date function compatible.
Code:
/**
* Offsets date-time if time is present and $serverTimeOffset 1, then formats to CB's configured date-time format.
*
* @param int|string $date In "Y-m-d H:i:s" format, or int : unix timestamp
* @param boolean $serverTimeOffset False: don't offset, true: offset if time also in $date
* @param bool|string $showTime False don't show time even if time is present in string, timeago: show jquery timeago
* @param null|string $dateFormatOverride Format override for date display
* @param null|string $timeFormatOverride Format override for time display
* @param null|string|int $offsetOverride Offset override for time display
* @return null|string
*/
function cbFormatDate( $date, $serverTimeOffset = true, $showTime = true, $dateFormatOverride = null, $timeFormatOverride = null, $offsetOverride = null ) {