minor fixes

README.md

@@ -38,7 +38,7 @@ All these methods return an instance of `IEnumerator<DateOnly>`.
 | dayOfMonth     | The day of the month. Takes the last day of the month if `dayOfMonth` is more than the days in the month. |
 | dayOfYear      | The day of the year.                                                                                      |
 | weekDays       | Days of the week.                                                                                         |
-| numberOfWeek   | Index of dayOfWeek in the month.                                                                          |
+| indexOfDay     | Index of dayOfWeek in the month.                                                                          |
 | numberOfMonth  | The number of the month.                                                                                  |
 | firstDayOfWeek | The first day of the week.                                                                                |
 

src/DateRecurrenceR/Collections/MonthlyEnumeratorLimitByCount.cs

@@ -55,6 +55,6 @@ public void Dispose()
 
     private static int GetMonthNumber(DateOnly date)
     {
-        return 12 * date.Year + date.Month;
+        return MonthsInYear * date.Year + date.Month;
     }
 }

src/DateRecurrenceR/Collections/MonthlyEnumeratorLimitByDate.cs

@@ -53,6 +53,6 @@ public void Dispose()
 
     private static int GetMonthNumber(DateOnly date)
     {
-        return 12 * date.Year + date.Month;
+        return MonthsInYear * date.Year + date.Month;
     }
 }

src/DateRecurrenceR/Core/MonthOfYear.cs

@@ -10,7 +10,7 @@ namespace DateRecurrenceR.Core;
 #endif
 {
     private const int MinVal = 1;
-    private const int MaxVal = 12;
+    private const int MaxVal = MonthsInYear;
 
     private readonly int _value;
 

src/DateRecurrenceR/Core/WeekDays.cs

@@ -25,7 +25,6 @@ public WeekDays(DayOfWeek day)
     /// </summary>
     /// <param name="day1"><see cref="DayOfWeek" /></param>
     /// <param name="day2"><see cref="DayOfWeek" /></param>
-
     public WeekDays(DayOfWeek day1, DayOfWeek day2)
         : this(day1, day2, day2)
     {

src/DateRecurrenceR/Helpers/MonthlyRecurrenceHelper.cs

@@ -33,8 +33,8 @@ private static bool DateOutOfRangeByMonth(DateOnly beginDate, int addMonth)
 
     private static int SubtractMonth(DateOnly minuendDate, DateOnly subtractedDate)
     {
-        var minuend = minuendDate.Year * 12 + minuendDate.Month;
-        var subtracted = subtractedDate.Year * 12 + subtractedDate.Month;
+        var minuend = minuendDate.Year * MonthsInYear + minuendDate.Month;
+        var subtracted = subtractedDate.Year * MonthsInYear + subtractedDate.Month;
 
         return minuend - subtracted;
     }

src/DateRecurrenceR/Internals/Constant.cs

@@ -3,4 +3,5 @@ namespace DateRecurrenceR.Internals;
 internal struct Constant
 {
     public const int DaysInWeek = 7;
+    public const int MonthsInYear = 12;
 }