diff --git a/lib/src/common/recurrence_frequency.dart b/lib/src/common/recurrence_frequency.dart
new file mode 100644
index 00000000..e983c980
--- /dev/null
+++ b/lib/src/common/recurrence_frequency.dart
@@ -0,0 +1,10 @@
+// // For compatability towards v4.x or below.
+
+import 'package:device_calendar/device_calendar.dart';
+
+class RecurrenceFrequency {
+  static var Daily = Frequency.daily;
+  static var Weekly = Frequency.weekly;
+  static var Monthly = Frequency.monthly;
+  static var Yearly = Frequency.yearly;
+}
diff --git a/lib/src/models/recurrence_rule.dart b/lib/src/models/recurrence_rule.dart
new file mode 100644
index 00000000..039e3f4a
--- /dev/null
+++ b/lib/src/models/recurrence_rule.dart
@@ -0,0 +1,152 @@
+import 'package:device_calendar/src/common/calendar_enums.dart';
+import 'package:rrule/rrule.dart';
+
+import '../common/error_messages.dart';
+import '../common/recurrence_frequency.dart';
+
+class RecurrenceRuleLegacy {
+  int? totalOccurrences;
+
+  /// The interval between instances of a recurring event
+  int? interval;
+
+  /// The date a series of recurring events should end
+  DateTime? endDate;
+
+  /// The frequency of recurring events
+  RecurrenceFrequency? recurrenceFrequency;
+
+  /// The days of the week that this event occurs on. Only applicable to recurrence rules with a weekly, monthly or yearly frequency
+  List<DayOfWeek>? daysOfWeek = [];
+
+  /// A day of the month that this event occurs on. Only applicable to recurrence rules with a monthly or yearly frequency
+  int? dayOfMonth;
+
+  /// A month of the year that the event occurs on. Only applicable to recurrence rules with a yearly frequency
+  MonthOfYear? monthOfYear;
+
+  /// Filters which recurrences to include in the recurrence rule’s frequency. Only applicable when _isByDayOfMonth is false
+  WeekNumber? weekOfMonth;
+
+  final String _totalOccurrencesKey = 'totalOccurrences';
+  final String _recurrenceFrequencyKey = 'recurrenceFrequency';
+  final String _intervalKey = 'interval';
+  final String _endDateKey = 'endDate';
+  final String _daysOfWeekKey = 'daysOfWeek';
+  final String _dayOfMonthKey = 'dayOfMonth';
+  final String _monthOfYearKey = 'monthOfYear';
+  final String _weekOfMonthKey = 'weekOfMonth';
+
+  RecurrenceRuleLegacy(this.recurrenceFrequency,
+      {this.totalOccurrences,
+      this.interval,
+      this.endDate,
+      this.daysOfWeek,
+      this.dayOfMonth,
+      this.monthOfYear,
+      this.weekOfMonth})
+      : assert(!(endDate != null && totalOccurrences != null),
+            'Cannot specify both an end date and total occurrences for a recurring event');
+
+  RecurrenceRuleLegacy.fromJson(Map<String, dynamic>? json) {
+    if (json == null) {
+      throw ArgumentError(ErrorMessages.fromJsonMapIsNull);
+    }
+
+    int? recurrenceFrequencyIndex = json[_recurrenceFrequencyKey];
+    if (recurrenceFrequencyIndex == null || recurrenceFrequencyIndex >= 4) {
+      throw ArgumentError(ErrorMessages.invalidRecurrencyFrequency);
+    }
+
+    Map<String, dynamic> newJson = {};
+    switch (recurrenceFrequencyIndex) {
+      case 1:
+        newJson['recurrenceRule']['freq'] = 'DAILY';
+        break;
+      case 2:
+        newJson['recurrenceRule']['freq'] = 'WEEKLY';
+        break;
+      case 3:
+        newJson['recurrenceRule']['freq'] = 'MONTHLY';
+        break;
+      case 4:
+        newJson['recurrenceRule']['freq'] = 'YEARLY';
+        break;
+      default:
+    }
+
+    newJson['count'] = json[_totalOccurrencesKey];
+
+    newJson[_intervalKey] = json[_intervalKey];
+
+    int? endDateMillisecondsSinceEpoch = json[_endDateKey];
+    if (endDateMillisecondsSinceEpoch != null) {
+      newJson['until'] =
+          DateTime.fromMillisecondsSinceEpoch(endDateMillisecondsSinceEpoch)
+              .toIso8601String();
+    }
+
+    List<dynamic>? daysOfWeekValues = json[_daysOfWeekKey];
+    if (daysOfWeekValues != null && daysOfWeekValues is! List<int>) {
+      daysOfWeek = daysOfWeekValues
+          .cast<int>()
+          .map((value) => value.getDayOfWeekEnumValue)
+          .toList();
+    }
+    // newJson['WKST'] = ??;
+
+    newJson['byMonthDays'] = json[_dayOfMonthKey];
+    newJson['BYMONTH'] = convertDynamicToInt(json[_monthOfYearKey]);
+
+    // newJson['BYWEEKNO'] =
+    //     convertDynamicToInt(json[_weekOfMonthKey])?.getWeekNumberEnumValue;
+
+    RecurrenceRule.fromJson(newJson);
+  }
+
+  int? convertDynamicToInt(dynamic value) {
+    value = value?.toString();
+    return value != null ? int.tryParse(value) : null;
+  }
+
+  // Map<String, dynamic> toJson() {
+  //   final data = <String, dynamic>{};
+
+  //   if (totalOccurrences != null) {
+  //     data['count'] = totalOccurrences;
+  //   }
+
+  //   if (interval != null) {
+  //     data[_intervalKey] = interval;
+  //   }
+
+  //   if (endDate != null) {
+  //     data[_endDateKey] = endDate!.millisecondsSinceEpoch;
+  //   }
+
+  //   data[_recurrenceFrequencyKey] = recurrenceFrequency?.index;
+
+  //   if (daysOfWeek?.isNotEmpty == true) {
+  //     data[_daysOfWeekKey] = daysOfWeek!.map((d) => d.value).toList();
+  //   }
+
+  //   if (monthOfYear != null &&
+  //       recurrenceFrequency == RecurrenceFrequency.Yearly) {
+  //     data[_monthOfYearKey] = monthOfYear!.value;
+  //   }
+
+  //   if (recurrenceFrequency == RecurrenceFrequency.Monthly ||
+  //       recurrenceFrequency == RecurrenceFrequency.Yearly) {
+  //     if (weekOfMonth != null) {
+  //       data[_weekOfMonthKey] = weekOfMonth!.value;
+  //     } else {
+  //       // Days of the month should not be added to the recurrence parameter when WeekOfMonth is used
+  //       if (dayOfMonth != null) {
+  //         data[_dayOfMonthKey] = dayOfMonth;
+  //       }
+  //     }
+  //   }
+
+  //   return data;
+  // }
+}