leap day properties fix

fixedcal/core/date.py

@@ -52,6 +52,15 @@ class FixedDate:
         # return self._year % 4 == 0
         return is_leap_year(self._year)
 
+    @property
+    def is_leap_day(self) -> bool:
+        """Whether this fixed date is a leap day (June 29th in fixed) of IFC system.
+
+        Returns:
+            bool: Whether this is a leap day
+        """
+        return self.is_leap_year and self._day_of_year == 169
+
     @property
     def datetime(self) -> datetime:
         """Construct a native datetime object from fixed date.
@@ -68,11 +77,15 @@ class FixedDate:
     @property
     def day_of_month(self):
         """In range 1...29"""
+        if self.is_leap_day:
+            return 29
         return ((self._day_of_year-1) % 28) + 1
 
     @property
     def month(self):
         """In range 1...13"""
+        if self.is_leap_day:
+            return 6
         return ((self._day_of_year-1) // 28) + 1
 
     @property
@@ -93,6 +106,8 @@ class FixedDate:
         """
         if self.is_year_day:
             return 1
+        if self.is_leap_day:
+            return 4
         return ((self.day_of_month-1) // 7) + 1
 
     @property
@@ -102,6 +117,8 @@ class FixedDate:
         Returns:
             int: 1 for Sunday, 2 for Monday, 7 for Saturday
         """
+        if self.is_leap_day:
+            return None
         return ((self.day_of_month-1) % 7) + 1
 
     @property
@@ -111,6 +128,8 @@ class FixedDate:
         Returns:
             int: In range 1...53
         """
+        if self.is_leap_day:
+            return 24
         return ((self._day_of_year-1) // 7) + 1
 
     @property

tests/leap_year_test.py

@@ -23,6 +23,18 @@ class TestLeapYear(unittest.TestCase):
         fixed_date = FixedDate(datetime(2000, 5, 4))
         self.assertTrue(fixed_date.is_leap_year)
 
+
+    def test_fixed_leap_day_properties(self):
+        # June 17th is the leap day of fixed calendar system
+        fixed_date = FixedDate(datetime(2024, 6, 17))
+        self.assertEqual(fixed_date.day_of_month, 29)
+        self.assertEqual(fixed_date.month, 6)
+        self.assertIsNone(fixed_date.weekday)
+        self.assertEqual(fixed_date.week_of_month, 4)
+        self.assertEqual(fixed_date.week_of_year, 24)
+        self.assertEqual(fixed_date.year_quarter, 2)
+
+
     def test_fixed_date_difference_over_gregorian_leap_day(self):
         # in Gregorian system there are 7 days between,
         # but in IFC the leap day is at the end of June