[Refactor] Make `getFormatedDate()` pure

Gestion/src/views/ApplicationsView.vue

@@ -208,9 +208,8 @@ export default {
       }
     },
     getFormatedDate (value) {
-      let dateTimeParts = value.split(/[- :]/)
-      dateTimeParts[1]--
-      let date = new Date(...dateTimeParts)
+      const dateTimePart = value.split(/[- :]/)[1] - 1
+      const date = new Date(dateTimePart)
       return date.getDate() + '/' + (date.getMonth() + 1) + '/' + date.getFullYear() + ' à ' + ('0' + date.getHours()).slice(-2) + ':' + ('0' + date.getMinutes()).slice(-2)
     },
     customSort: function (items, column, descending) {