add comment to explain why we are avoiding the dateString constructor option for our Date object

app/assets/javascripts/due_date_select.js.es6

@@ -83,6 +83,7 @@
       this.rawSelectedDate = $(`input[name='${this.fieldName}']`).val();
 
       if (this.rawSelectedDate.length) {
+        // Construct Date object manually to avoid buggy dateString support within Date constructor
         const dateArray = this.rawSelectedDate.split('-').map(v => parseInt(v, 10));
         const dateObj = new Date(dateArray[0], dateArray[1] - 1, dateArray[2]);
         this.displayedDate = $.datepicker.formatDate('M d, yy', dateObj);