Test migration to jest by hand

Apparently using regular expressions is way easier.

test/JSONToDate/JSONToDate.js

@@ -0,0 +1,5 @@
+const JSONToDate = arr => {
+const dt = new Date(parseInt(arr.toString().substr(6)));
+return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
+};
+module.exports = JSONToDate;