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Hello,

onMonthChange event is firedonly when a month is changed by click on left or right arrow in the calendar header.

The solution can be the following:

var calendar = new dhtmlxCalendarObject('dhtmlxCalendarObj', false, {isYearEditable: true,isMonthEditable: true});

....

var onYS = calendar.onYearSelect;
var onMS = calendar.onMonthSelect;
  
calendar.onYearSelect = function(value) {
    doOnYearSelect(value);
    return onYS.apply(this,[value])
}
calendar.onMonthSelect = function(value) {
    doOnMonthSelect(value);
    return onMS.apply(this,[value])
}
/*a custom function that will be called when month changed*/
function doOnMonthSelect(value){
   /*your code here*/
}

/*a custom function that will be called when year changed*/
function doOnYearSelect(value){
   /*your code here*/
}