Refactor date handling in CalendarView: Update date formatting to use local timezone instead of UTC, enhancing accuracy in date representation. Introduce a new helper method for consistent date formatting across the component. This change improves the overall user experience by ensuring dates are displayed correctly.

frontend/src/views/personal/CalendarView.vue

@@ -351,7 +351,12 @@ export default {
             return this.currentDate.toLocaleDateString(this.$i18n.locale, options);
         },
         currentDateStr() {
-            return this.currentDate.toISOString().split('T')[0];
+            // Local timezone formatting to avoid UTC conversion issues
+            const d = this.currentDate;
+            const year = d.getFullYear();
+            const month = String(d.getMonth() + 1).padStart(2, '0');
+            const day = String(d.getDate()).padStart(2, '0');
+            return `${year}-${month}-${day}`;
         },
         monthDays() {
             const year = this.currentDate.getFullYear();
@@ -372,8 +377,10 @@ export default {
                 date.setDate(startDate.getDate() + i);
                 const dayOfWeekNum = date.getDay();
                 
+                // Local timezone formatting
+                const dateStr = `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;
                 days.push({
-                    date: date.toISOString().split('T')[0],
+                    date: dateStr,
                     dayNumber: date.getDate(),
                     currentMonth: date.getMonth() === month,
                     isToday: date.getTime() === today.getTime(),
@@ -395,8 +402,10 @@ export default {
                 date.setDate(monday.getDate() + i);
                 const dayOfWeek = date.getDay();
                 
+                // Local timezone formatting
+                const dateStr = `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;
                 days.push({
-                    date: date.toISOString().split('T')[0],
+                    date: dateStr,
                     dayNumber: date.getDate(),
                     weekday: this.weekDays[i],
                     isToday: date.getTime() === today.getTime(),
@@ -414,8 +423,10 @@ export default {
             const dayIndex = date.getDay();
             const weekdayIndex = dayIndex === 0 ? 6 : dayIndex - 1;
             
+            // Local timezone formatting
+            const dateStr = `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;
             return {
-                date: date.toISOString().split('T')[0],
+                date: dateStr,
                 dayNumber: date.getDate(),
                 month: this.getMonthKey(date.getMonth()),
                 year: date.getFullYear(),
@@ -445,6 +456,13 @@ export default {
             const months = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
             return months[monthIndex];
         },
+        // Helper: Format date as YYYY-MM-DD in local timezone (not UTC!)
+        formatDateLocal(date) {
+            const year = date.getFullYear();
+            const month = String(date.getMonth() + 1).padStart(2, '0');
+            const day = String(date.getDate()).padStart(2, '0');
+            return `${year}-${month}-${day}`;
+        },
         navigatePrev() {
             const newDate = new Date(this.currentDate);
             switch (this.currentView) {
@@ -540,7 +558,7 @@ export default {
             this.selectedDates = [];
             const current = new Date(start);
             while (current <= end) {
-                this.selectedDates.push(current.toISOString().split('T')[0]);
+                this.selectedDates.push(this.formatDateLocal(current));
                 current.setDate(current.getDate() + 1);
             }
         },
@@ -601,7 +619,7 @@ export default {
         // Dialog methods
         openNewEventDialog(dateStr = null, hour = null, endDateStr = null) {
             this.editingEvent = null;
-            const today = new Date().toISOString().split('T')[0];
+            const today = this.formatDateLocal(new Date());
             
             this.eventForm = {
                 title: '',