Fix latest days of the month as birth day in italian SSN (#1941)

faker/providers/ssn/it_IT/__init__.py

@@ -8018,8 +8018,10 @@ def ssn(self) -> str:
         surname: str = self._get_surname_letters()
         name: str = self._get_name_letters(sex)
         year: str = "%02d" % self.random_int(min=0, max=99)
+        is_leap_year: bool = self.is_leap_year(int(year))
         month: str = self.random_element(MONTHS_LIST)
-        day: str = "%02d" % (self.random_int(min=1, max=28) + (40 if sex == 1 else 0))
+        max_day: int = self._get_max_day(is_leap_year=is_leap_year, month=month)
+        day: str = "%02d" % (self.random_int(min=1, max=max_day) + (40 if sex == 1 else 0))
         municipality: str = self.random_element(MUNICIPALITIES_LIST)
         code: str = f"{surname}{name}{year}{month}{day}{municipality}"
         return code + checksum(code)
@@ -8125,3 +8127,25 @@ def _pad_shorter(sequence: str) -> str:
         Pads shorter string with the allowed char
         """
         return sequence.ljust(3, "X")
+
+    @staticmethod
+    def is_leap_year(year: int) -> bool:
+        """
+        Checks if the one given is a leap year
+        """
+        if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
+            return True
+        return False
+
+    @staticmethod
+    def _get_max_day(is_leap_year: bool, month: str) -> int:
+        """
+        Returns the maximum day for the current month
+        """
+        if month in ["D", "H", "P", "S"]:
+            max_day = 30
+        elif month == "B":
+            max_day = 29 if is_leap_year else 28
+        else:
+            max_day = 31
+        return max_day