timezone causes test failures in parser tests

The tests appear to be timezone-specific, and fail for me when I run them (I'm in CET).

BZR_PLUGINS_AT=cvspsimport@/home/jelmer/src/bzr-cvspsimport/build-area/bzr-cvsps-import-0.0.1~bzr63 /usr/bin/bzr selftest -s bp.cvspsimport
bzr selftest: /usr/bin/bzr
   /usr/lib/python2.7/dist-packages/bzrlib
   bzr-2.3.0dev5 python-2.7.1 Linux-2.6.37-9-generic-x86_64-with-Ubuntu-11.04-natty

FAIL: bzrlib.plugins.cvspsimport.test_cvsps_parser.TestParser.test_complex
    Text attachment: log
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Text attachment: traceback
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Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 169, in _run_user
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 499, in _run_test_method
    return self._get_test_method()()
  File "/home/jelmer/src/bzr-cvspsimport/build-area/bzr-cvsps-import-0.0.1~bzr63/test_cvsps_parser.py", line 229, in test_complex
    self.assertEqual(1164052415.000, ps.timestamp)
AssertionError: not equal:
a = 1164052415.0
b = 1164027215.0

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FAIL: bzrlib.plugins.cvspsimport.test_cvsps_parser.TestParser.test_simple
    Text attachment: log
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Text attachment: traceback
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Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 169, in _run_user
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 499, in _run_test_method
    return self._get_test_method()()
  File "/home/jelmer/src/bzr-cvspsimport/build-area/bzr-cvsps-import-0.0.1~bzr63/test_cvsps_parser.py", line 212, in test_simple
    self.assertEqual(1164052337.000, ps.timestamp)
AssertionError: not equal:
a = 1164052337.0
b = 1164027137.0

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======================================================================
FAIL: bzrlib.plugins.cvspsimport.test_cvsps_parser.TestParser.test_complex
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_StringException: Text attachment: log
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------------
Text attachment: traceback
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Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 169, in _run_user
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 499, in _run_test_method
    return self._get_test_method()()
  File "/home/jelmer/src/bzr-cvspsimport/build-area/bzr-cvsps-import-0.0.1~bzr63/test_cvsps_parser.py", line 229, in test_complex
    self.assertEqual(1164052415.000, ps.timestamp)
AssertionError: not equal:
a = 1164052415.0
b = 1164027215.0

------------

======================================================================
FAIL: bzrlib.plugins.cvspsimport.test_cvsps_parser.TestParser.test_simple
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_StringException: Text attachment: log
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------------
Text attachment: traceback
------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 169, in _run_user
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 499, in _run_test_method
    return self._get_test_method()()
  File "/home/jelmer/src/bzr-cvspsimport/build-area/bzr-cvsps-import-0.0.1~bzr63/test_cvsps_parser.py", line 212, in test_simple
    self.assertEqual(1164052337.000, ps.timestamp)
AssertionError: not equal:
a = 1164052337.0
b = 1164027137.0

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----------------------------------------------------------------------
Ran 53 tests in 6.281s

FAILED (failures=2)