components/WarningHeader.tsx

@@ -1,21 +1,11 @@
 import { parse } from "date-fns";
-import { utcToZonedTime, zonedTimeToUtc } from "date-fns-tz";
 import React from "react";
 
 import warnings from "../content/warnings/warnings.json";
+import { DATE_FORMAT, getLocalDateFromEST } from "../utils";
 
 import styles from "./WarningHeader.module.css";
 
-// Had to add these functions here, since we cannot use import the file from ./lib/events since that uses libraries only on the serverside
-const WARNING_DATE_FORMAT = "MMMM dd yyyy HH:mm";
-function getLocalDateFromEST(date: Date) {
-  return utcToZonedTime(
-    // The parsed date is in EST
-    zonedTimeToUtc(date, "America/Toronto"),
-    Intl.DateTimeFormat().resolvedOptions().timeZone
-  );
-}
-
 interface Warning {
   message: string;
   startDate: string;
@@ -32,8 +22,8 @@ function getCurrentWarning(): Warning | null {
     }
 
     // convert dates to date objects in EST time zone
-    let startDate = parse(warning.startDate, WARNING_DATE_FORMAT, new Date());
-    let endDate = parse(warning.endDate, WARNING_DATE_FORMAT, new Date());
+    let startDate = parse(warning.startDate, DATE_FORMAT, new Date());
+    let endDate = parse(warning.endDate, DATE_FORMAT, new Date());
 
     if (
       !startDate ||

lib/events.ts

@@ -2,14 +2,19 @@ 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";
 
 import type { Props } from "../pages/events/[year]/[term]/index";
 // do not use alias "@/utils" as generate-calendar imports a function from this file and ts-node is not compatible
-import { Term, TERMS, isTerm } from "../utils";
+import {
+  Term,
+  TERMS,
+  isTerm,
+  DATE_FORMAT,
+  getLocalDateFromEST,
+} from "../utils";
 
 const EVENTS_PATH = path.join("content", "events");
 
@@ -55,8 +60,6 @@ export interface Event {
   metadata: Metadata;
 }
 
-export const DATE_FORMAT = "MMMM dd yyyy HH:mm";
-
 export async function getEventBySlug(
   year: string,
   term: Term,
@@ -284,12 +287,3 @@ function getFutureTerm(year: string, term: Term): { year: string; term: Term } {
         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

@@ -8,7 +8,7 @@ import { serialize } from "next-mdx-remote/serialize";
 
 import { isTerm, Term, TERMS } from "@/utils";
 
-import { DATE_FORMAT, getLocalDateFromEST } from "./events";
+import { DATE_FORMAT, getLocalDateFromEST } from "../utils";
 
 export const NEWS_PATH = path.join("content", "news");
 

utils.ts

@@ -1,5 +1,8 @@
+import { utcToZonedTime, zonedTimeToUtc } from "date-fns-tz";
+
 export const TERMS = ["winter", "spring", "fall"] as const;
 export type Term = typeof TERMS[number];
+export const DATE_FORMAT = "MMMM dd yyyy HH:mm";
 
 // https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates
 export function isTerm(x: string): x is Term {
@@ -9,3 +12,12 @@ export function isTerm(x: string): x is Term {
 export function capitalize(str: string) {
   return str.slice(0, 1).toUpperCase() + str.slice(1);
 }
+
+// Converts a date to local time
+export function getLocalDateFromEST(date: Date): Date {
+  return utcToZonedTime(
+    // The date parameter is in EST
+    zonedTimeToUtc(date, "America/Toronto"),
+    Intl.DateTimeFormat().resolvedOptions().timeZone
+  );
+}