Added a Workarond for the DST (European Daylight Saving Time (DST))

src/component/event/events.ts

@@ -1,6 +1,6 @@
 import { Database } from "bun:sqlite";
 import { TEventType, type TEvent } from "./event.types";
-import { getTsNow, pad_l2, transformArray } from "../../util";
+import { getTsNow, pad_l2, transformArray, formatTimeDiff, isEuropeanDST, subtractHours } from "../../util";
 
 const BASE_URL = "https://77th-jsoc.com/service.php?action=get_events";
 
@@ -26,6 +26,21 @@ export type TEventEntityNew = Omit<TEventEntity, "event_uid">
 
 export class Event implements TEventEntity {
   static table_name: "events"
+  event_uid: number;
+  uid: string;
+  title: string;
+  description: string;
+  date_at: string;
+  time_start: string;
+  time_end: string;
+  posted_by: string;
+  location: string;
+  event_type: TEventEntity["event_type"];
+  timezone: string;
+  link: string;
+  notification: TEventEntity["notification"];
+  deleteDate: TEventEntity["deleteDate"];
+
   static createTable (db: Database): void {
     const query = db.query(`CREATE TABLE IF NOT EXISTS "events" (
       "event_uid" INTEGER NOT NULL,
@@ -104,21 +119,6 @@ export class Event implements TEventEntity {
     return query.all(); 
   }
 
-  event_uid: number;
-  uid: string;
-  title: string;
-  description: string;
-  date_at: string;
-  time_start: string;
-  time_end: string;
-  posted_by: string;
-  location: string;
-  event_type: TEventEntity["event_type"];
-  timezone: string;
-  link: string;
-  notification: TEventEntity["notification"];
-  deleteDate: TEventEntity["deleteDate"];
-
   constructor(event_uid: number, uid: string, title: string, description: string, date_at: string, time_start: string, time_end: string, posted_by: string, location: string, event_type: TEventEntity["event_type"], timezone: string, link: string, notification: TEventEntity["notification"], deleteDate: TEventEntity["deleteDate"]) {
     this.event_uid = event_uid;
     this.uid = uid;
@@ -195,10 +195,13 @@ export class Event implements TEventEntity {
     return `${title_prefix_arr.length >= 1 ? ( title_prefix_arr.join(" " ) + " - ") : "" }${this.title} (${ TEventType[ this.event_type ] })`;
   }
   get_body() {
+    const BaseTime = new Date(`${this.date_at} 21:00`);
+    const RelativeEventTime = new Date(`${this.date_at} ${this.get_time_start()}`);
+    const TimeDiff = formatTimeDiff( BaseTime, RelativeEventTime);
     const body = [
       `Title: ${this.title}`,
       `Date: ${this.date_at}`,
-      `Time: ${this.time_start}`,
+      `Time: ${this.get_time_start()}${ TimeDiff ? ` (Optime ${TimeDiff})` : "" }`,
       `Type: ${ TEventType[ this.event_type ] }`,
       `Location: ${this.location}`,
       `By: ${this.posted_by}`,
@@ -219,4 +222,15 @@ export class Event implements TEventEntity {
     }
     return false;
   }
+
+  get_time_start () {
+    const date = new Date( `${this.date_at} ${this.time_start}` );
+    if ( ! isEuropeanDST( date ) ) {
+      const newDate = subtractHours( date, 1);
+      const hours = newDate.getHours();
+      const minutes = newDate.getMinutes();
+      return `${pad_l2(hours)}:${pad_l2(minutes)}`;
+    }
+    return this.time_start;
+  }
 }

src/util.ts

@@ -41,4 +41,51 @@ export function getTsNow() {
 }
 
 export function unixToDate( unix_timestamp: number ) { return new Date(unix_timestamp * 1000) }
-export function dateToUnix( date: Date ) { return Math.round( date.getTime()/1000 ) }
+export function dateToUnix( date: Date ) { return Math.round( date.getTime()/1000 ) }
+
+export function formatTimeDiff(dateA: Date, dateB: Date) {
+  // Difference in milliseconds
+  const diffMs = dateB.getTime() - dateA.getTime();
+
+  // Get sign (+ or -)
+  const sign = diffMs < 0 ? "-" : "";
+
+  // Convert to absolute minutes
+  const diffMinutes = Math.floor(Math.abs(diffMs) / 60000);
+
+  // Split into hours and minutes
+  const hours = Math.floor(diffMinutes / 60);
+  const minutes = diffMinutes % 60;
+
+  // Return formatted string
+  return `${sign}${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}`;
+}
+
+export function subtractHours(date: Date, hours: number) {
+  // Create a new Date so we don't mutate the original
+  return new Date(date.getTime() - hours * 60 * 60 * 1000);
+}
+
+// Helper: get last Sunday of a given month
+function lastSundayOfMonth(year: number, month: number ) {
+  const lastDay = new Date(Date.UTC(year, month + 1, 0)); // last day of month
+  const day = lastDay.getUTCDay(); // 0 = Sunday
+  const diff = day === 0 ? 0 : day; // how far back to go to reach Sunday
+  lastDay.setUTCDate(lastDay.getUTCDate() - diff);
+  return lastDay;
+}
+
+export function isEuropeanDST( date: Date ) {
+  const year = date.getFullYear();
+
+  // DST starts: last Sunday in March, 01:00 UTC
+  const start = lastSundayOfMonth(year, 2); // March (month = 2)
+  start.setUTCHours(1, 0, 0, 0);
+
+  // DST ends: last Sunday in October, 01:00 UTC
+  const end = lastSundayOfMonth(year, 9); // October (month = 9)
+  end.setUTCHours(1, 0, 0, 0);
+
+  // Return true if within DST period
+  return date >= start && date < end;
+}