daveVk - 11:56 pm on Sep 13, 2012 (gmt 0)
datejs usage of clone() is like
var myDate = new Date();
var cloneDate = myDate.clone();
It has added a method called 'clone' to objects created with the Date Constructor.
So objects NOT created with the Date Constructor will not be effected, and are free to have a clone property of there own.
".clone()" only has meaning in the context of what object it follows.