Bug report

Bug summary

When plotting dates with time zone information on the x-axis, under certain circumstances, the wrong year will be displayed as the label.

Code for reproduction

import matplotlib.pyplot as plt
import pytz
from datetime import datetime, timedelta

x = [datetime(2010, 1, 1, tzinfo=pytz.timezone('America/New_York')) + timedelta(i) for i in range(2000)]
plt.plot(x, [0] * len(x));

Actual outcome

The first label on the plot is 2009.

Expected outcome

The first label on the plot is 2010.

Matplotlib version

Built this morning from master. Also confirmed the issue on 3.0.0 and confirmed that 2.2.2 does not have the issue (or at least not with the reproduction steps I found.)

• Operating system: Debian 7.11
• Matplotlib version: from source
• Matplotlib backend module://ipykernel.pylab.backend_inline
• Python version: 3.7.0
• Jupyter version (if applicable): 4.4.0
• Other libraries: pytz 2018.5

I built matplotlib from source to verify that this bug affects master. The checks against 3.0.0 and 2.2.2 were done on a conda install of those versions and may have had different versions of pytz and jupyter.