Change lib functions to support new format

lib/events.ts

@@ -1,6 +1,8 @@
 import fs from "fs/promises";
 import path from "path";
 
+import { parse } from "date-fns";
+import { utcToZonedTime, zonedTimeToUtc } from "date-fns-tz";
 import matter from "gray-matter";
 import { MDXRemoteSerializeResult } from "next-mdx-remote";
 import { serialize } from "next-mdx-remote/serialize";
@@ -26,6 +28,16 @@ export async function getEventTermsByYear(year: string): Promise<string[]> {
     .sort((a, b) => TERMS.indexOf(a) - TERMS.indexOf(b));
 }
 
+interface RawMetadata {
+  name: string;
+  poster?: string;
+  short: string;
+  date: string;
+  online?: boolean;
+  location: string;
+  registerLink?: string;
+}
+
 interface Metadata {
   name: string;
   poster?: string;
@@ -42,21 +54,28 @@ export interface Event {
   metadata: Metadata;
 }
 
+export const DATE_FORMAT = "MMMM dd yyyy HH:mm";
+
 export async function getEventBySlug(
   year: string,
   term: string,
   slug: string
 ): Promise<Event> {
-  const raw = await fs.readFile(
+  const file = await fs.readFile(
     path.join(EVENTS_PATH, year, term, `${slug}.md`),
     "utf-8"
   );
-  const { content, data: metadata } = matter(raw);
+  const { content, data } = matter(file);
+  const raw = data as RawMetadata;
 
   return {
     content: await serialize(content),
     metadata: {
-      ...metadata,
+      ...raw,
+      online: raw.online ?? false,
+      date: getLocalDateFromEST(
+        parse(raw.date, DATE_FORMAT, new Date())
+      ).toString(),
       // permaLink is based on the directory structure in /pages
       permaLink: `/events/${year}/${term}/${slug}`,
     } as Metadata,
@@ -270,3 +289,12 @@ function getFutureTerm(
         term: TERMS[index + 1],
       };
 }
+
+// The date that's returned should be in local time
+export function getLocalDateFromEST(date: Date) {
+  return utcToZonedTime(
+    // The parsed date is in EST
+    zonedTimeToUtc(date, "America/Toronto"),
+    Intl.DateTimeFormat().resolvedOptions().timeZone
+  );
+}

lib/news.ts

@@ -1,11 +1,14 @@
 import fs from "fs/promises";
 import path from "path";
 
+import { parse } from "date-fns";
 import matter from "gray-matter";
 import { MDXRemoteSerializeResult } from "next-mdx-remote";
 import { serialize } from "next-mdx-remote/serialize";
 
-const NEWS_PATH = path.join("content", "news");
+import { DATE_FORMAT, getLocalDateFromEST } from "./events";
+
+export const NEWS_PATH = path.join("content", "news");
 const TERMS = ["winter", "spring", "fall"];
 
 export interface Metadata {
@@ -62,7 +65,12 @@ export async function getNewsBySlug(
 
   return {
     content: await serialize(content),
-    metadata: metadata as Metadata,
+    metadata: {
+      ...metadata,
+      date: getLocalDateFromEST(
+        parse(metadata.date, DATE_FORMAT, new Date())
+      ).toString(),
+    } as Metadata,
   };
 }