Fix 24 hour format

Author: wangwillian0

lib/accessory/accessory_list_item.dart

@@ -48,7 +48,7 @@ class AccessoryListItem extends StatelessWidget {
         }
         // Format published date in a human readable way
         String? dateString = accessory.datePublished != null
-          ? ' · ${DateFormat('dd.MM.yyyy kk:mm').format(accessory.datePublished!)}'
+          ? ' · ${DateFormat('dd.MM.yyyy HH:mm').format(accessory.datePublished!)}'
           : '';
         return ListTile(
           onTap: onTap,

lib/item_management/item_management.dart

@@ -30,7 +30,7 @@ class KeyManagement extends StatelessWidget {
           child: ListView(
             children: accessories.map((accessory) {
               String lastSeen = accessory.datePublished != null
-                ? DateFormat('dd.MM.yyyy kk:mm').format(accessory.datePublished!)
+                ? DateFormat('dd.MM.yyyy HH:mm').format(accessory.datePublished!)
                 : 'Unknown';
               return ListTile(
                 onTap: () {