fix: Use DayNumber instead of DayOfYear to compare DateOnly instances (#1228)

Author: hangy

src/Humanizer.Tests.Shared/DateOnlyHumanizeTests.cs

@@ -51,6 +51,21 @@ public void DefaultStrategy_DaysAgo()
             Assert.Equal(expectedResult, actualResult);
         }
 
+        [Fact]
+        public void DefaultStrategy_YearsAgo()
+        {
+            Configurator.DateOnlyHumanizeStrategy = new DefaultDateOnlyHumanizeStrategy();
+
+            var baseDate = DateTime.Now;
+            var inputTime = DateOnly.FromDateTime(baseDate.AddMonths(-24));
+            var baseTime = DateOnly.FromDateTime(baseDate);
+
+            const string expectedResult = "2 years ago";
+            var actualResult = inputTime.Humanize(baseTime);
+
+            Assert.Equal(expectedResult, actualResult);
+        }
+
         [Fact]
         public void PrecisionStrategy_NextDay()
         {

src/Humanizer/DateTimeHumanizeStrategy/DateTimeHumanizeAlgorithms.cs

@@ -154,12 +154,12 @@ public static string DefaultHumanize(DateTime input, DateTime comparisonBase, Cu
         public static string DefaultHumanize(DateOnly input, DateOnly comparisonBase, CultureInfo culture)
         {
             var tense = input > comparisonBase ? Tense.Future : Tense.Past;
-            var diffDays = Math.Abs(comparisonBase.DayOfYear - input.DayOfYear);
+            var diffDays = Math.Abs(comparisonBase.DayNumber - input.DayNumber);
             var ts = new TimeSpan(diffDays, 0, 0, 0);
 
             var sameMonth = comparisonBase.AddMonths(tense == Tense.Future ? 1 : -1) == input;
 
-            var days = Math.Abs(input.DayOfYear - comparisonBase.DayOfYear);
+            var days = Math.Abs(input.DayNumber - comparisonBase.DayNumber);
 
             return DefaultHumanize(ts, sameMonth, days, tense, culture);
         }