Bring pure Python (datetime|date|time).replace behavior in line with C

pganssle · pganssle · commit dea1eaf3b3d3 · 2017-10-30T13:01:41.000-04:00
diff --git a/Lib/datetime.py b/Lib/datetime.py
@@ -828,7 +828,7 @@ def replace(self, year=None, month=None, day=None):
             month = self._month
         if day is None:
             day = self._day
-        return date(year, month, day)
+        return type(self)(year, month, day)
 
     # Comparisons of date objects with other.
 
@@ -1316,7 +1316,7 @@ def replace(self, hour=None, minute=None, second=None, microsecond=None,
             tzinfo = self.tzinfo
         if fold is None:
             fold = self._fold
-        return time(hour, minute, second, microsecond, tzinfo, fold=fold)
+        return type(self)(hour, minute, second, microsecond, tzinfo, fold=fold)
 
     # Pickle support.
 
@@ -1597,7 +1597,7 @@ def replace(self, year=None, month=None, day=None, hour=None,
             tzinfo = self.tzinfo
         if fold is None:
             fold = self.fold
-        return datetime(year, month, day, hour, minute, second,
+        return type(self)(year, month, day, hour, minute, second,
                           microsecond, tzinfo, fold=fold)
 
     def _local_timezone(self):
