Validate leap year dates correctly

personnummer/personnummer.py

@@ -80,7 +80,11 @@ def is_male(self):
         return int(gender_digit) % 2 != 0
 
     def is_coordination_number(self):
-        return test_date(int(self.parts['year']), int(self.parts['month']), int(self.parts['day']) - 60)
+        return test_date(
+            int(self.parts['century'] + self.parts['year']),
+            int(self.parts['month']),
+            int(self.parts['day']) - 60,
+        )
 
     @staticmethod
     def get_parts(ssn):
@@ -133,6 +137,7 @@ def valid(self):
         :return:
         """
 
+        century = self.parts['century']
         year = self.parts['year']
         month = self.parts['month']
         day = self.parts['day']
@@ -144,10 +149,10 @@ def valid(self):
 
         is_valid = luhn(year + month + day + num) == int(check)
 
-        if is_valid and test_date(int(year), int(month), int(day)):
+        if is_valid and test_date(int(century + year), int(month), int(day)):
             return True
 
-        return is_valid and test_date(int(year), int(month), int(day) - 60)
+        return is_valid and test_date(int(century + year), int(month), int(day) - 60)
 
 
 def luhn(data):