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// ...
var hours_array = [];
var hours_list = [];
var current_time = new Date;
if (working_hours_array !== undefined && working_hours_array.length > 0) {
    hours_array = working_hours_array; // working_hours_array: [11, 22]
}
if (hours_array !== undefined && hours_array.length == 2) {;
    for (var i = parseInt(hours_array[0]); i <= parseInt(hours_array[1]); i++) {
        var hour = i;
        hours_list.push(hour);
    }
    var current_hour = current_time.getHours();
    current_hour = parseInt(current_hour);
    if (test_mode) {
        current_hour = 23;
    }
    var hour_found = false;
    for (var j = 0; j < hours_list.length; j++) {
        if (hours_list[j] == current_hour) {
            hour_found = true;
            break;
        }
    }
    // ...
}