refactor

public/js/utils/dateUtils.js

@@ -0,0 +1,68 @@
+/**
+ * Date utility functions
+ */
+
+/**
+ * Format date from YYYY-MM-DD to DD.MM.YYYY
+ * @param {string} dateStr - Date in YYYY-MM-DD format
+ * @returns {string} - Date in DD.MM.YYYY format
+ */
+export function formatDateDisplay(dateStr) {
+  const [year, month, day] = dateStr.split('-');
+  return `${day}.${month}.${year}`;
+}
+
+/**
+ * Format date from DD.MM.YYYY to YYYY-MM-DD
+ * @param {string} dateStr - Date in DD.MM.YYYY format
+ * @returns {string} - Date in YYYY-MM-DD format
+ */
+export function formatDateISO(dateStr) {
+  const [day, month, year] = dateStr.split('.');
+  return `${year}-${month}-${day}`;
+}
+
+/**
+ * Get today's date in YYYY-MM-DD format
+ * @returns {string} - Today's date
+ */
+export function getTodayISO() {
+  const today = new Date();
+  const year = today.getFullYear();
+  const month = String(today.getMonth() + 1).padStart(2, '0');
+  const day = String(today.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+}
+
+/**
+ * Get day of week name in German
+ * @param {Date} date - Date object
+ * @returns {string} - German day name (Mo, Di, Mi, etc.)
+ */
+export function getDayOfWeek(date) {
+  const days = ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'];
+  return days[date.getDay()];
+}
+
+/**
+ * Get month name in German
+ * @param {number} monthIndex - Month index (0-11)
+ * @returns {string} - German month name
+ */
+export function getMonthName(monthIndex) {
+  const months = [
+    'Januar', 'Februar', 'März', 'April', 'Mai', 'Juni',
+    'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'
+  ];
+  return months[monthIndex];
+}
+
+/**
+ * Check if date is weekend or holiday
+ * @param {Date} date - Date object
+ * @returns {boolean} - True if weekend or holiday
+ */
+export function isWeekendOrHoliday(date) {
+  const dayOfWeek = date.getDay();
+  return dayOfWeek === 0 || dayOfWeek === 6; // Sunday or Saturday
+}