powerpc: Test*Parser* fail with AssertionError: 2262-04-10T00:12:45.292707840+0000 != 2262-04-10T00:12:45.292707840+0000
Detected by Debian build farm
https://buildd.debian.org/status/fetch.php?pkg=pandas&arch=powerpc&ver=0.12.0~rc1%2Bgit112-gb79996c-1&stamp=1374189622&file=log

```
======================================================================
FAIL: test_nat_parse (pandas.io.tests.test_parsers.TestCParserHighMemory)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_parsers.py", line 607, in test_nat_parse
    tm.assert_frame_equal(result,df)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 238, in assert_frame_equal
    check_less_precise=check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 197, in assert_series_equal
    assert_almost_equal(left.values, right.values, check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 141, in assert_almost_equal
    assert_almost_equal(a[i], b[i], check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 172, in assert_almost_equal
    assert a == b, "%s != %s" % (a, b)
AssertionError: 2262-04-10T00:12:45.292707840+0000 != 2262-04-10T00:12:45.292707840+0000

======================================================================
FAIL: test_nat_parse (pandas.io.tests.test_parsers.TestCParserLowMemory)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_parsers.py", line 607, in test_nat_parse
    tm.assert_frame_equal(result,df)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 238, in assert_frame_equal
    check_less_precise=check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 197, in assert_series_equal
    assert_almost_equal(left.values, right.values, check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 141, in assert_almost_equal
    assert_almost_equal(a[i], b[i], check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 172, in assert_almost_equal
    assert a == b, "%s != %s" % (a, b)
AssertionError: 2262-04-10T00:12:45.292707840+0000 != 2262-04-10T00:12:45.292707840+0000

======================================================================
FAIL: test_nat_parse (pandas.io.tests.test_parsers.TestPythonParser)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_parsers.py", line 607, in test_nat_parse
    tm.assert_frame_equal(result,df)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 238, in assert_frame_equal
    check_less_precise=check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 197, in assert_series_equal
    assert_almost_equal(left.values, right.values, check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 141, in assert_almost_equal
    assert_almost_equal(a[i], b[i], check_less_precise)
  File "/«BUILDDIR»/pandas-0.12.0~rc1+git112-gb79996c/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 172, in assert_almost_equal
    assert a == b, "%s != %s" % (a, b)
AssertionError: 2262-04-10T00:12:45.292707840+0000 != 2262-04-10T00:12:45.292707840+0000
```

good news -- those seems to be the only failures on powerpc (for python 2.7 at least, python 3 did not have chance to get any testing yet due to 2.7 failing)
