old_contents: from __future__ import unicode_literals
  
  import pyaavso
  
  
  class VisualFormatWriter(object):
      """
      A class responsible for writing observation data in AAVSO
      `Visual File Format`_.
  
      The API here mimics the ``csv`` module in Python standard library.
  
      .. _`Visual File Format`: http://www.aavso.org/aavso-visual-file-format
      """
  
      def __init__(self, fp, observer_code, delimiter=',', date_format='JD', obstype='Visual'):
          """
          Creates the writer which will write observations into the file-like
          object given in first parameter. The only other required parameter
          is the official AAVSO-assigned observer code.
          """
          self.observer_code = observer_code
          self.date_format = date_format
          self.obstype = obstype
          fp.write('#TYPE=Visual\n')
          fp.write('#OBSCODE=%s\n' % observer_code)
          fp.write("#SOFTWARE=pyaavso %s\n" % pyaavso.get_version())
  
new_contents: from __future__ import unicode_literals
  
  import pyaavso
  
  
  class VisualFormatWriter(object):
      """
      A class responsible for writing observation data in AAVSO
      `Visual File Format`_.
  
      The API here mimics the ``csv`` module in Python standard library.
  
      .. _`Visual File Format`: http://www.aavso.org/aavso-visual-file-format
      """
  
      def __init__(self, fp, observer_code, delimiter=',', date_format='JD', obstype='Visual'):
          """
          Creates the writer which will write observations into the file-like
          object given in first parameter. The only other required parameter
          is the official AAVSO-assigned observer code.
          """
          self.observer_code = observer_code
          self.date_format = date_format
          self.obstype = obstype
          fp.write('#TYPE=Visual\n')
          fp.write('#OBSCODE=%s\n' % observer_code)
          fp.write("#SOFTWARE=pyaavso %s\n" % pyaavso.get_version())
          fp.write("#DATE=%s\n" % date_format.upper())
  
subject: Write date format in header.