refactor: replace moment library with luxon

lib/utils.ts

@@ -1,16 +1,57 @@
 import { clsx, type ClassValue } from "clsx"
 import { twMerge } from "tailwind-merge"
-import moment from "moment-timezone"
+import { DateTime } from "luxon"
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
 
-export function getDateInTimezone(date: Date | string, timezone: string): Date {
-  const m = moment.tz(date, timezone);
-  return new Date(m.format('YYYY-MM-DDTHH:mm:ss.SSS[Z]'));
+// get today's date string for timezone
+export function getTodayInTimezone(timezone: string): string {
+  const now = getNow({ timezone });
+  return d2s({ dateTime: now, format: 'yyyy-MM-dd' });
 }
 
-export function getTodayInTimezone(timezone: string): string {
-  return moment.tz(timezone).format('YYYY-MM-DD');
+// get datetime object of now
+export function getNow({ timezone = 'utc' }: { timezone?: string }) {
+  return DateTime.now().setZone(timezone);
+}
+
+// get current time in epoch milliseconds
+export function getNowInMilliseconds() {
+  const now = getNow({});
+  return d2n({ dateTime: now });
+}
+
+// iso timestamp to datetime object, most for storage read
+export function t2d({ timestamp, timezone }: { timestamp: string; timezone?: string }) {
+  return DateTime.fromISO(timestamp).setZone(timezone);
+}
+
+// convert datetime object to iso timestamp, mostly for storage write
+export function d2t({ dateTime, timezone = 'utc' }: { dateTime: DateTime, timezone?: string }) {
+  return dateTime.setZone(timezone).toISO()!;
+}
+
+// convert datetime object to string, mostly for display
+export function d2s({ dateTime, format }: { dateTime: DateTime, format?: string }) {
+  if (format) {
+    return dateTime.toFormat(format);
+  }
+  return dateTime.toLocaleString(DateTime.DATETIME_MED);
+}
+
+// convert datetime object to date string, mostly for display
+export function d2sDate({ dateTime }: { dateTime: DateTime }) {
+  return dateTime.toLocaleString(DateTime.DATE_MED);
+}
+
+// convert datetime object to epoch milliseconds string, mostly for storage write
+export function d2n({ dateTime }: { dateTime: DateTime }) {
+  return dateTime.toMillis().toString();
+}
+
+// compare the date portion of two datetime objects (i.e. same year, month, day)
+export function isSameDate(a: DateTime, b: DateTime) {
+  return a.hasSame(b, 'day');
 }