refactor: rewrite scheduler as functional

packages/backend/src/apps/scheduler/common/get-date-time-object.ts

@@ -0,0 +1,14 @@
+import { DateTime } from 'luxon';
+
+export default function getDateTimeObjectRepresentation(dateTime: DateTime) {
+  const defaults = dateTime.toObject();
+
+  return {
+    ...defaults,
+    ISO_date_time: dateTime.toISO(),
+    pretty_date: dateTime.toLocaleString(DateTime.DATE_MED),
+    pretty_time: dateTime.toLocaleString(DateTime.TIME_WITH_SECONDS),
+    pretty_day_of_week: dateTime.toFormat('cccc'),
+    day_of_week: dateTime.weekday,
+  };
+}