Remove datetime_parser argument from DateTimeField

rest_framework/fields.py

@@ -891,11 +891,10 @@ class DateTimeField(Field):
     default_timezone = timezone.get_default_timezone() if settings.USE_TZ else None
     datetime_parser = datetime.datetime.strptime
 
-    def __init__(self, format=empty, datetime_parser=None, input_formats=None, default_timezone=None, *args, **kwargs):
+    def __init__(self, format=empty, input_formats=None, default_timezone=None, *args, **kwargs):
         self.format = format if format is not empty else self.format
         self.input_formats = input_formats if input_formats is not None else self.input_formats
         self.default_timezone = default_timezone if default_timezone is not None else self.default_timezone
-        self.datetime_parser = datetime_parser if datetime_parser is not None else self.datetime_parser
         super(DateTimeField, self).__init__(*args, **kwargs)
 
     def enforce_timezone(self, value):