Original report at SourceForge, opened Wed Feb 9 17:11:10 2011

The function matplotlib.pyplot.plot_date has a keyword argument tz that may contain a time zone for formatting the time values.
This argument is ignored.

matplotlib.version == '1.0.1'

Details

The keyword argument tz is really erroneously ignored in
matplotlib.axes.Axes.xaxis_date (file "axes.py", line 2679)
but it matters for the high level function matplotlib.pyplot.plot_date.

SourceForge Comments

On Mon Feb 21 08:16:09 2011, eike wrote:

See also this discussion on Stack Overflow:
http://stackoverflow.com/questions/4485607/matplotlib-plot-date-keeping-times-in-utc-even-with-custom-timezone