#NEWLINE# def __init__( self , verbose_name_start = _ ( 'Period from' ) , verbose_name_end = _ ( 'until' ) , **kw ) : #NEWLINE# #INDENT# kw . update ( start_date = models . DateField ( verbose_name_end , blank = True , null = True , default = self . get_default_start_date , help_text = _ ( 'Start date of observed period' ) ) , end_date = models . DateField ( verbose_name_end , blank = True , null = True , default = self . get_default_end_date , help_text = _ ( 'End date of observed period' ) ) ) #NEWLINE# super ( ObservedPeriod , self ) . __init__ ( ** kw )