refactor(web): move util js functions into a separate file

web/static/js/utils.js

@@ -0,0 +1,42 @@
+function datetimeToLocalISO(datetime) {
+	var options = {
+		year: "numeric",
+		month: "2-digit",
+		day: "2-digit",
+		hour: "2-digit",
+		minute: "2-digit",
+		second: "2-digit",
+		timeZoneName: "longOffset",
+	};
+	var formatter = new Intl.DateTimeFormat("sv-SE", options);
+	var date = new Date(datetime);
+	return formatter
+		.formatToParts(date)
+		.map(({ type, value }) => {
+			if (type === "timeZoneName") {
+				return value.slice(3);
+			} else {
+				return value;
+			}
+		})
+		.join("")
+		.replace(" ", "T")
+		.replace(" ", "");
+}
+
+function escapedString(str) {
+	return str
+		.replace("&", "&")
+		.replace("<", "&lt;")
+		.replace(">", "&gt;")
+		.replace("\n", "<br>");
+}
+
+function formToJSON(form) {
+	formdata = form.serializeArray();
+	data = {};
+	$(formdata).each(function (index, obj) {
+		data[obj.name] = obj.value;
+	});
+    return data;
+}