Fix stupid timezone issues

server/helper/dateHelper.ts

@@ -1,6 +1,8 @@
-import { format } from "date-fns";
+import { format, isToday, toDate } from "date-fns";
+import {utcToZonedTime} from "date-fns-tz"
 import { GuildScheduledEvent } from "discord.js";
 import { logger } from "../logger";
+import de from "date-fns/locale/de";
 
 export function createDateStringFromEvent(event: GuildScheduledEvent, requestId: string, guildId?: string): string {
     if(!event.scheduledStartAt) {
@@ -8,9 +10,14 @@ export function createDateStringFromEvent(event: GuildScheduledEvent, requestId:
         return `"habe keinen Startzeitpunkt ermitteln können"`
     }
 
-    const date = format(event.scheduledStartAt, "dd.MM")
-    const time = format(event.scheduledStartAt, "HH:mm")
-
+    const timeZone = 'Europe/Berlin'
+    const zonedDateTime = utcToZonedTime(event.scheduledStartAt, timeZone)
+    const time = format(zonedDateTime, "HH:mm", {locale: de})
+    
+    if(isToday(zonedDateTime)) {
+        return `heute um ${time}`
+    }
 
+    const date = format(zonedDateTime, "eeee dd.MM", {locale: de})
     return `am ${date} um ${time}`
 }