[egenix-users] Matplotlib (pylab) datetime incompatible with Egenix mxDateTime

[Simon Hook]

Hi,

[cross posted to egenix and matplotlib]

I have been using the egenix mxDateTime module and want to plot some of 
the dates with Matplotlib (pylab). Pylab uses num2date and date2num to 
covert datesandtimes to floating point values for plotting. 
Unfortunately if you give pylab date2num an egenix DateTime object, 
pylab bombs. Is there a simple way to use egenix DateTime objects with 
Pylab?

Below is a simple example

#D:\apps\Python23\python.exe

from datetime import *
from mx.DateTime import *
from pylab import *

# This works
a=datetime(2005,10,10,5,5,5)
print a

# This works
b=DateTime(2005,10,10,5,5,5)
print b

# This works
c=date2num(a)
print c

# This fails
d=date2num(b)
print d

The output and failure message is:

2005-10-10 05:05:05
2005-10-10 05:05:05.00
732229.211863
Traceback (most recent call last):
  File "datetime-problem.py", line 20, in ?
    d=date2num(b)
  File "D:\apps\Python23\lib\site-packages\matplotlib\dates.py", line 
174, in da
te2num
    if not iterable(d): return _to_ordinalf(d)
  File "D:\apps\Python23\lib\site-packages\matplotlib\dates.py", line 
137, in _t
o_ordinalf
    base =  dt.toordinal()
AttributeError: toordinal


thanks, Simon