On Fri, Jul 11, 2008 at 12:37 PM, Francesc Alted <[EMAIL PROTECTED]> wrote:
> A Friday 11 July 2008, Francesc Alted escrigué: > > A Friday 11 July 2008, Jon Wright escrigué: > > > Hello, > > > > > > Nice idea - please can you make it work with matplotlib's time/date > > > stuff too? > > > > Hmmm, following the matplotlib docstrings: > > > > """ > > datetime objects are converted to floating point numbers > > which represent the number of days since 0001-01-01 UTC > > """ > > > > So it is using something similar to the ``timefloat64`` in our > > proposal, but with a different scale (it is counting days instead of > > microseconds) and a different epoch (0001-01-01 UTC instead of > > 1970-01-01 UTC). > > > > So, it seems that setters/getters for matplotlib datetime could be > > supported, maybe at the risk of loosing precision. We should study > > this more carefully, but I suppose that if there is interest enough > > that could be implemented, yes. > > Now that I think about this, wouldn't be better if, after the eventual > introduction of the new datetime types in NumPy, the matplotlib would > use any of these three and throw away their current datetime class? > [Unless they have good reasons for keeping their epoch and/or scale] > Especially as there was a ten day adjustment made with the adoption of the Gregorian calender on Oct 4, 1582; early dates can be hard to interpret. Curiously, IIRC, 01/01/0001 was a Monday. Chuck
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