  VERSION = __version__  # synonym
  
  # Header encoding (see RFC5987)
  HTTP_HEADER_ENCODING = 'iso-8859-1'
 
</s> remove     'TIME_OUTPUT_FORMAT': None,
 </s> add     'TIME_OUTPUT_FORMAT': ISO8601, </s> remove     'DATETIME_OUTPUT_FORMAT': None,
 </s> add     'DATETIME_OUTPUT_FORMAT': ISO8601, </s> remove     'DATE_OUTPUT_FORMAT': None,
 </s> add     'DATE_OUTPUT_FORMAT': ISO8601, </s> remove         '%Y-%m-%d',              # '1984-07-31'
        '%Y-%m-%d %H:%M',        # '1984-07-31 04:31'
        '%Y-%m-%d %H:%M:%S',     # '1984-07-31 04:31:59'
        '%Y-%m-%d %H:%M:%S.%f',  # '1984-07-31 04:31:59.000200'
 </s> add         ISO8601, </s> remove         '%H:%M',        # '04:31'
        '%H:%M:%S',     # '04:31:59'
        '%H:%M:%S.%f',  # '04:31:59.000200'
 </s> add         ISO8601,
# Default input and output format
ISO8601 = 'iso-8601'
  VERSION = __version__  # synonym
  
  # Header encoding (see RFC5987)
  HTTP_HEADER_ENCODING = 'iso-8859-1'
# Default input and output format
ISO8601 = 'iso-8601'
keep keep keep add
 Add new ISO8601 setting + integration 
rest_framework/__init__.py