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It seems strange to me that xmlrpclib.ServerProxy has a use_datetime 
argument, but not SimpleXMLRPCServer or CGIXMLRPCRequestHandler.
I'm hereby submitting a patch to fix this.
Sorry for the shaky testing (I only really test SimpleXMLRPCDispatcher), 
but trying to test at the SimpleXMLRPCServer level using the current http_server() scheme quickly became dirty, so I backed off.

Presumably the patch needs reworking as SimpleXMLRPCServer has been incorporated into the new xmlrpc package for Python 3.

At EuroPython, Virgil remarked that there was some discussion of this patch somewhere.

2096158376e5 broke test_xmlrpc:
"""
======================================================================
ERROR: test_datetime_before_1900 (test.test_xmlrpc.XMLRPCTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/cf/python/cpython/Lib/test/test_xmlrpc.py", line 62, in test_datetime_before_1900
 (newdt,), m = xmlrpclib.loads(s, use_datetime=1)
 File "/home/cf/python/cpython/Lib/xmlrpc/client.py", line 969, in loads
 p.feed(data)
 File "/home/cf/python/cpython/Lib/xmlrpc/client.py", line 430, in feed
 self._parser.Parse(data, 0)
 File "/home/cf/python/cpython/Lib/xmlrpc/client.py", line 662, in end
 return f(self, "".join(self._data))
 File "/home/cf/python/cpython/Lib/xmlrpc/client.py", line 745, in end_dateTime
 value = _datetime_type(data)
 File "/home/cf/python/cpython/Lib/xmlrpc/client.py", line 359, in _datetime_type
 return datetime.strptime(data, "%Y%m%dT%H:%M:%S")
 File "/home/cf/python/cpython/Lib/_strptime.py", line 488, in _strptime_datetime
 tt, fraction = _strptime(data_string, format)
 File "/home/cf/python/cpython/Lib/_strptime.py", line 337, in _strptime
 (data_string, format))
ValueError: time data '10210T11:41:23' does not match format '%Y%m%dT%H:%M:%S'
----------------------------------------------------------------------
"""
That's because datetime.strptime() expects a year ("%Y") on exactly 4 digits:
"""
 #XXX: Does 'Y' need to worry about having less or more than
 # 4 digits?
 'Y': r"(?P<Y>\d\d\d\d)",
"""

Latest comment is unrelated to this feature request.
It goes with issue #13305.

See issue #13297 for a similar case with bytes.
Should we implement a "use_builtin_types" flag which supersedes "use_datetime"?

This is the proposed patch which could be applied after issue #13297 is solved.

Patch updated with documentation.

Looks good.

New changeset b3c1a504ebc1 by Florent Xicluna in branch 'default':
Closes #2979: add parameter 'use_builtin_types' to the SimpleXMLRPCServer.
http://hg.python.org/cpython/rev/b3c1a504ebc1