onBeforeAdd

fires before a new comment is added

void onBeforeAdd(number id,object obj,number index);

id	number	the ID of the new comment
obj	object	the comment object
index	number	the position of the new comment within the comment history

$$("comments").attachEvent("onBeforeAdd",function(id,obj,index){
    // your code here
    const day = obj.date.getDay();
});