Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #39669

Re: time as float since Jan 1, 0001?

Show all headers | View raw

In article <mailman.2342.1361626870.2939.python-list@python.org>,
 Mark Lawrence <breamoreboy@yahoo.co.uk> wrote:

> 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

Duh!  I didn't get that far in the docs!  Thanks, that makes life a lot 
easier.

Still, it seems like allowing toordinal() and fromordinal() to handle 
floats would be a useful addition :-)

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web