✨ Handle yearly recurring event with leap year

lib/src/event_controller.dart

@@ -131,7 +131,6 @@ class EventController<T extends Object?> extends ChangeNotifier {
   // Returns true if event should repeat on the given date otherwise false.
   // For monthly repetition of event event start date & given date should match.
   // repetition will include the recurrence end date.
-  // TODO(Shubham): Handle feb or 30/31 dates.
   bool _isMonthlyRecurrence({
     required DateTime currentDate,
     required DateTime startDate,
@@ -150,6 +149,9 @@ class EventController<T extends Object?> extends ChangeNotifier {
             currentDate.isAtSameMomentAs(recurrenceEndDate));
   }
 
+  // If end date is not mentioned repeat infinitely
+  // If end date is mentioned repeat till end date including last date
+  // End date will change in case of "Following events" are deleted
   bool _isYearlyRecurrence({
     required DateTime currentDate,
     required DateTime startDate,

lib/src/modals.dart

@@ -2,11 +2,9 @@
 // Use of this source code is governed by a MIT-style license
 // that can be found in the LICENSE file.
 
+import 'package:calendar_view/calendar_view.dart';
 import 'package:flutter/material.dart';
 
-import 'enumerations.dart';
-import 'typedefs.dart';
-
 /// Settings for hour lines
 class HourIndicatorSettings {
   final double height;
@@ -221,22 +219,35 @@ class RecurrenceSettings {
     return resultDate;
   }
 
+  /// Calculate end date for yearly recurring event
   DateTime get _endDateYearly {
     var occurrences = (interval ?? 1) - 1;
     var nextDate = startDate;
 
+    // If the start date is not 29th Feb, we can directly calculate last year.
+    if (startDate.day != 29 && startDate.month != DateTime.february) {
+      return DateTime(
+        nextDate.year + occurrences,
+        startDate.month,
+        startDate.day,
+      );
+    }
+    // TODO(Shubham): Optimize for larger recurrences if required
     while (occurrences > 0) {
-      nextDate = DateTime(
+      final newDate = DateTime(
         nextDate.year + 1,
-        nextDate.month,
-        nextDate.day,
+        startDate.month,
+        startDate.day,
       );
 
-      // TODO(Shubham): Verify for invalid date in next month
-      // Identify leap year and update next date accordingly
-      // if (nextDate.day != startDate.day) {
-      //   continue;
-      // }
+      // If month changes that means that date does not exist in given year
+      if (newDate.month != startDate.month) {
+        nextDate = DateTime(
+          newDate.year,
+        );
+        continue;
+      }
+      nextDate = newDate;
       occurrences--;
     }
     return nextDate;