old_contents: from dateutil.parser import parse as _parse
  
  
  def parse(string, agnostic=False, **kwargs):
      parsed = _parse(string, **kwargs)
      if agnostic or (parsed == _parse(string, yearfirst=True, **kwargs)
                             == _parse(string, dayfirst=True, **kwargs)):
          return parsed
      else:
          raise ValueError("The date was ambiguous: %s" % string)
  
new_contents: from dateutil.parser import parse as _parse
  
  
  def parse(string, agnostic=False, **kwargs):
      return _parse(string, yearfirst=True, dayfirst=False, **kwargs)
  
subject: Update _parse.py