DatePicker: Fix year picker

packages/date-picker/src/panel/date.vue

@@ -310,7 +310,7 @@
 
         this.date.setFullYear(year);
         if (this.selectionMode === 'year') {
-          this.$emit('pick', new Date(year));
+          this.$emit('pick', new Date(year, 0, 1));
         } else {
           this.currentView = 'month';
         }