def METHOD_NAME(filename):
  with open(filename, 'rb') as f:
    content = f.read().decode('utf-8')
  d = datetime.datetime.utcnow()
  # pylint: disable=line-too-long
  new_content = re.sub(
      r'WebRTC source stamp [0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}',
      r'WebRTC source stamp %02d-%02d-%02dT%02d:%02d:%02d' %
      (d.year, d.month, d.day, d.hour, d.minute, d.second),
      content,
      flags=re.MULTILINE)
  # pylint: enable=line-too-long
  with open(filename, 'wb') as f:
    f.write(new_content.encode('utf-8'))