ipython nbconvert crashes with ValueError: Invalid format string.

[p3trus]

Using the latest code (pulled this morning) nbconvert throws the following exception. I tried it on an empty Notebook as well. The command used was ipython nbconvert Untitled01.ipynb.

Traceback (most recent call last):
  File "C:\Python27\Scripts\ipython-script.py", line 9, in <module>
    load_entry_point('ipython==1.0.dev', 'console_scripts', 'ipython')()
  File "c:\workspace\ipython\IPython\__init__.py", line 118, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "c:\workspace\ipython\IPython\config\application.py", line 539, in launch
_instance
    app.start()
  File "c:\workspace\ipython\IPython\terminal\ipapp.py", line 362, in start
    return self.subapp.start()
  File "c:\workspace\ipython\IPython\nbconvert\nbconvertapp.py", line 176, in st
art
    self.convert_notebooks()
  File "c:\workspace\ipython\IPython\nbconvert\nbconvertapp.py", line 197, in co
nvert_notebooks
    config=self.config)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 61, in
 decorator
    return f(*args, **kwargs)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 214, i
n export_by_name
    return globals()[function_name](nb, **kw)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 61, in
 decorator
    return f(*args, **kwargs)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 157, i
n export_full_html
    return export(FullHTMLExporter, nb, **kw)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 61, in
 decorator
    return f(*args, **kwargs)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\export.py", line 122, i
n export
    output, resources = exporter_instance.from_filename(nb, resources)
  File "c:\workspace\ipython\IPython\nbconvert\exporters\exporter.py", line 218,
 in from_filename
    resources['metadata']['modified_date'] = modified_date.strftime("%B %-d, %Y"
)
ValueError: Invalid format string

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    c.Application.verbose_crash=True

[p3trus]

Seems to be the same as #3719 . Closing it.