anchor.diff:  output_file = ''
   date_option = ''
   date_format = 'YYYY-MM-DDTHH:MM:SS'
  +iWantMilliseconds = .false.
   
   ! Number of arguments
   narg = command_argument_count()
  
positive.code: character(len=512) :: output_file
  character(len=32) :: date_option
  character(len=32) :: date_format
  
  end module
  
  
negative.code: use dateutil, only: input_file, &
                      output_file, &
                      date_option, &
                      date_format, &
                      iWantMilliseconds
  
  implicit none
  
  