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From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: time as float since Jan 1, 0001?
Date: Sat, 23 Feb 2013 13:41:24 +0000
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Xref: csiph.com comp.lang.python:39667

On 23/02/2013 13:29, Roy Smith wrote:
> 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?
>

IIRC you needn't bother, matplotlib will do all the conversions for you. 
  In the highly likely case that I'm wrong this should help 
http://matplotlib.org/api/dates_api.html#module-matplotlib.dates

-- 
Cheers.

Mark Lawrence