time as float since Jan 1, 0001?

From	Roy Smith <roy@panix.com>
Newsgroups	comp.lang.python
Subject	time as float since Jan 1, 0001?
Date	2013-02-23 08:29 -0500
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<roy-41E67E.08290123022013@news.panix.com> (permalink)

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I'm working with matplotlib.plot_date(), which represents time as 
"floats starting at January 1st, year 0001".  Is there any 
straight-forward way to get that out of a datetime?

datetime.toordinal() gives me the number of days since that epoch, but 
as an integer.  I figured it wouldn't be too hard to just do:

t.toordinal() + t.time().total_seconds()

except it turns out that only timedelta supports total_seconds(); time 
doesn't!

I suppose I could do:

t.toordinal() + t.hour / 24.0 \
              + t.minute / 1440.0 \
              + t.second / 86400.0

but that's really ugly.  Is there no cleaner way to do this conversion?

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time as float since Jan 1, 0001? Roy Smith <roy@panix.com> - 2013-02-23 08:29 -0500
  Re: time as float since Jan 1, 0001? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-02-23 13:41 +0000
    Re: time as float since Jan 1, 0001? Roy Smith <roy@panix.com> - 2013-02-23 08:49 -0500
      Re: time as float since Jan 1, 0001? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-23 14:08 -0500
  Re: time as float since Jan 1, 0001? Chris Angelico <rosuav@gmail.com> - 2013-02-24 00:45 +1100

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