pandas 0.17.0, python 2.7.10:

import pandas as pd
p = pd.Timestamp(2015, 11, 12)
p
Traceback (most recent call last):
File "", line 1, in
File "pandas\tslib.pyx", line 339, in pandas.tslib.Timestamp.repr (pandas\tslib.c:9660)
AttributeError: 'int' object has no attribute 'freqstr'