Rollen Chunk 6: Team-Tab mit Matrix-Kalender und Genehmigungen

src/lib/format.ts

@@ -88,3 +88,20 @@ export function eachDay(start: string, end: string): string[] {
   }
   return days;
 }
+
+const WEEKDAY_SHORT = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"];
+
+export function weekdayShort(iso: string): string {
+  const [year, month, day] = iso.split("-").map(Number);
+  return WEEKDAY_SHORT[new Date(Date.UTC(year, month - 1, day)).getUTCDay()];
+}
+
+export function shortGermanDate(iso: string): string {
+  const [year, month, day] = iso.split("-").map(Number);
+  return new Date(Date.UTC(year, month - 1, day)).toLocaleDateString("de-DE", {
+    day: "2-digit",
+    month: "2-digit",
+    year: "numeric",
+    timeZone: "UTC",
+  });
+}