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

src/components/YearTable.tsx

@@ -25,11 +25,6 @@ interface YearTableProps {
 
 const WEEKDAY_SHORT = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"];
 
-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()];
-}
-
 const MONTH_SHORT = [
   "Jan",
   "Feb",
@@ -49,20 +44,12 @@ function daysInMonth(year: number, month: number): number {
   return new Date(Date.UTC(year, month + 1, 0)).getUTCDate();
 }
 
+import { shortGermanDate, weekdayShort } from "@/lib/format";
+
 function isoDate(year: number, month: number, day: number): string {
   return `${year}-${String(month + 1).padStart(2, "0")}-${String(day).padStart(2, "0")}`;
 }
 
-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",
-  });
-}
-
 export function YearTable({
   year,
   workEntries,