Hello mmitechnic,
yes it's a known issue which will be fixed in the next version in few days.
for waiting you can change the line 249 in the plugin field "Calendar" ( plugins/cck_field/calendar/calendar.php
) by :
$value = ( $options2['storage_format'] == '0' ) ? ( $value )? date( 'Y-m-d H:i:s', strtotime( $value ) ) : $value : strtotime( $value );<br>
Regards.
Lionel