DATEDIFF functions

Hi, I´ve started some tests with these functions (*) in the free version of the plugin and in principle I see they work fine for my needs.

My question is: Shall I have these functions in the free version or they are part of the paid version only ?

(*) Ex: For getting the number of months between two dates:
DATEDIFF(‘2013-10-27’, ‘2012-06-22’, ‘yyyy-mm-dd’, ‘m’)[‘months’]

(function(){
var diffObj = DATEDIFF(‘2013-10-27’, ‘2012-06-22’, ‘yyyy-mm-dd’, ‘y’);
return diffObj[‘years’]+’ years, ‘+diffObj[‘months’]+’ months and ‘+diffObj[‘days’]+’ days’;
})()