Fix bug in InternalDate regexp that failed to allow leading 0 in day - courtesy of Rimon Barr <rimon.barr@cornell.edu>
Fix bug in InternalDate regexp that failed to allow leading 0 in day - courtesy of Rimon Barr <rimon.barr@cornell.edu>

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator