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I didn't realize this, but apparently Python's strftime function doesn't support dates before 1900: >>> from datetime import datetime >>> d = datetime(1899, 1, 1) >>> d.strftime('%Y-%m-%d') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: year=1899 is before 1900; the datetime strftime() methods require year >= 1900 I'm sure I could hack together something myself to do this, but I figure the strftime function is there for a reason (and there also is a reason why it can't support pre-1900 dates). I need to be able to support dates before 1900. I'd just use str , but there's too much variation. In other words, it may or may not have microseconds or it may or may not have a timezone. Is there any solution to this? If it makes a difference, I'm doing this so that I can write the data to a text file and load it into a database using Oracle SQL*Loader. I essentially ended up doing Alex Martelli's answer. Here's a more complete implementation: >>> from datetime import datetime >>> d = datetime.now() >>> d = d.replace(microsecond=0, tzinfo=None) >>> str(d) '2009-10-29 11:27:27' The only difference is that str(d) is equivalent to d.isoformat(' ') .

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