Hi Stefan,

The windows buildbot throws the error

FAIL: test_creation_overflow (test_datetime.TestDateTime)
Traceback (most recent call last):
  File "C:\buildbot\numpy\b11\numpy-install25\Lib\site-packages\numpy\core\tests\test_datetime.py", line 68, in test_creation_overflow
    err_msg='Datetime conversion error for unit %s' % unit)
  File "..\numpy-install25\Lib\site-packages\numpy\testing\utils.py", line 313, in assert_equal
Items are not equal: Datetime conversion error for unit ms
 ACTUAL: 567052800
 DESIRED: 322689600000

Because window's longs are always 32 bit, I think this is a good indication that somewhere a long is being used instead of an intp.