datetime64 changes 
In [40]: bnds.date[1]
Out[40]: Timestamp('2000-02-17 00:00:00', tz=None)

In [41]: tmp = bnds.date.values[1]

In [42]: tmp
Out[42]: numpy.datetime64('2000-02-16T19:00:00.000000000-0500')

In [43]: tmp.astype('datetime64[D]')
Out[43]: numpy.datetime64('2000-02-17')

Anyone know why Out[42] is February 16? I'm quite confused and the documentation on numpy site doesn't seem to explain this issue.
