D:\download\temp\matplotlib-3.0.2-doc\doc>make htmlhelp
...
generating gallery for gallery\frontpage... [100%] membrane.py
generating gallery for gallery\misc... [ 57%] load_converter.py
Warning, treated as error:
D:\download\temp\matplotlib-3.0.2-doc\examples\misc\load_converter.py failed to execute correctly: Traceback (most recent call last):
  File "D:\download\temp\matplotlib-3.0.2-doc\examples\misc\load_converter.py", line 17, in <module>
    skiprows=1, usecols=(0, 2), unpack=True)
  File "c:\anaconda3\lib\site-packages\numpy\lib\npyio.py", line 1101, in loadtxt
    for x in read_data(_loadtxt_chunksize):
  File "c:\anaconda3\lib\site-packages\numpy\lib\npyio.py", line 1028, in read_data
    items = [conv(val) for (conv, val) in zip(converters, vals)]
  File "c:\anaconda3\lib\site-packages\numpy\lib\npyio.py", line 1028, in <listcomp>
    items = [conv(val) for (conv, val) in zip(converters, vals)]
  File "c:\anaconda3\lib\site-packages\numpy\lib\npyio.py", line 1087, in tobytes_first
    return conv(x.encode("latin1"))
  File "c:\anaconda3\lib\site-packages\matplotlib\dates.py", line 361, in __call__
    return super().__call__(s)
  File "c:\anaconda3\lib\site-packages\matplotlib\dates.py", line 335, in __call__
    return date2num(datetime.datetime(*time.strptime(s, self.fmt)[:6]))
  File "c:\anaconda3\lib\_strptime.py", line 559, in _strptime_time
    tt = _strptime(data_string, format)[0]
  File "c:\anaconda3\lib\_strptime.py", line 362, in _strptime
    (data_string, format))
ValueError: time data '19-Sep-03' does not match format '%d-%b-%y'

matplotlib: 3.0.2
numpy: 1.15.4
sphinx: 1.8.1
numpydoc: 0.8.0
sphinx-gallery: 0.2.0
Windows 10 with Chinese simplified language