MC-17269: Date format grid is not based on the locale defined in the back-office

Author: viktorpetryk

app/code/Magento/Ui/Component/Listing/Columns/Date.php

@@ -109,7 +109,6 @@ public function prepare()
             'months' => $months,
             'monthsShort' => $monthsShort,
         ];
-        $config['dateFormat'] = $this->timezone->getDateTimeFormat(\IntlDateFormatter::MEDIUM);
         $this->setData('config', $config);
 
         parent::prepare();

app/code/Magento/Ui/view/base/web/js/grid/columns/date.js

@@ -38,10 +38,11 @@ define([
          * @returns {String} Formatted date.
          */
         getLabel: function (value, format) {
+            var date;
             if (this.storeLocale !== undefined) {
                 moment.locale(this.storeLocale, utils.extend({}, this.calendarConfig));
             }
-            var date = moment(this._super());
+            date = moment(this._super());
 
             date = date.isValid() && value[this.index] ?
                 date.format(format || this.dateFormat) :