Backport PR #4085 : Fix nbconvert date formats for Windows.

IPython/nbconvert/exporters/exporter.py

@@ -33,7 +33,7 b' from IPython.config import Config'
 from IPython.nbformat import current as nbformat
 from IPython.utils.traitlets import MetaHasTraits, DottedObjectName, Unicode, List, Dict, Any
 from IPython.utils.importstring import import_item
-from IPython.utils.text import indent
+from IPython.utils import text
 from IPython.utils import py3compat
 
 from IPython.nbconvert import transformers as nbtransformers
@@ -47,7 +47,7 b' from IPython.nbconvert import filters'
 JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
 
 default_filters = {
-        'indent': indent,
+        'indent': text.indent,
         'markdown2html': filters.markdown2html,
         'ansi2html': filters.ansi2html,
         'filter_data_type': filters.DataTypeFilter,
@@ -282,7 +282,7 b' class Exporter(LoggingConfigurable):'
         resources['metadata']['name'] = notebook_name
 
         modified_date = datetime.datetime.fromtimestamp(os.path.getmtime(filename))
-        resources['metadata']['modified_date'] = modified_date.strftime("%B %d, %Y")
+        resources['metadata']['modified_date'] = modified_date.strftime(text.date_format)
         
         with io.open(filename) as f:
             return self.from_notebook_node(nbformat.read(f, 'json'), resources=resources,**kw)

IPython/nbconvert/transformers/sphinx.py

@@ -29,6 +29,7 b' from pygments.formatters import LatexFormatter'
 # Our own imports
 # Configurable traitlets
 from IPython.utils.traitlets import Unicode, Bool
+from IPython.utils import text
 
 # Needed to override transformer
 from .base import (Transformer)
@@ -157,7 +158,7 b' class SphinxTransformer(Transformer):'
             if self.publish_date:
                 resources["sphinx"]["date"] = self.publish_date
             elif len(resources['metadata']['modified_date'].strip()) == 0:
-                resources["sphinx"]["date"] = date.today().strftime("%B %-d, %Y")
+                resources["sphinx"]["date"] = date.today().strftime(text.date_format)
             else:
                 resources["sphinx"]["date"] = resources['metadata']['modified_date']
             
@@ -219,7 +220,7 b' class SphinxTransformer(Transformer):'
         if resources['metadata']['modified_date']:
             default_date = resources['metadata']['modified_date']
         else:
-            default_date = date.today().strftime("%B %-d, %Y")
+            default_date = date.today().strftime(text.date_format)
             
         user_date = console.input("Date (deafults to \"" + default_date + "\"): ")
         if len(user_date.strip()) == 0:

IPython/utils/text.py

@@ -21,6 +21,7 b' Inheritance diagram:'
 
 import os
 import re
+import sys
 import textwrap
 from string import Formatter
 
@@ -29,6 +30,16 b' from IPython.testing.skipdoctest import skip_doctest_py3, skip_doctest'
 from IPython.utils import py3compat
 
 #-----------------------------------------------------------------------------
+# Declarations
+#-----------------------------------------------------------------------------
+
+# datetime.strftime date format for ipython
+if sys.platform == 'win32':
+    date_format = "%B %d, %Y"
+else:
+    date_format = "%B %-d, %Y"
+
+#-----------------------------------------------------------------------------
 # Code
 #-----------------------------------------------------------------------------