Hi, Quoting Tomi Ollila (2015-04-22 15:37:15) > What do you mean by that datetime cannot handle dates before 1900 ? > > : $ python > : Python 2.7.6 (default, Mar 22 2014, 22:59:56) > : ... > : >>> datetime.datetime.strptime('1799-11', '%Y-%m') > : datetime.datetime(1799, 11, 1, 0, 0) > : >>> x=datetime.datetime.strptime('1799-11', '%Y-%m') > : >>> x.isoformat() > : '1799-11-01T00:00:00' from the docs: "The exact range of years for which strftime() works also varies across platforms. Regardless of platform, years before 1900 cannot be used." or: $ python Python 2.7.9 (default, Dec 11 2014, 08:58:12) [GCC 4.9.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import datetime >>> x=datetime.datetime.strptime('1799-11', '%Y-%m') >>> x.strftime("%P") Traceback (most recent call last): File "", line 1, in ValueError: year=1799 is before 1900; the datetime strftime() methods require year >= 1900 cheers, josch