Re^3: perl file formatting

[tybalt89]

#!/usr/bin/perl

# http://perlmonks.org/?node_id=1178418

use strict;
use warnings;

sub eightdigitdate
  {
  my @fields = localtime(shift);
  sprintf '%04d%02d%02d', $fields[5] + 1900, $fields[4] + 1, $fields[3
+];
  }

sub nextday
  {
  use Time::Local;
  shift() =~ /(\d{4})(\d\d)(\d\d)/;
  eightdigitdate( 60*60*24 + timelocal 0, 0, 12, $3, $2 - 1, $1 );
  }

#my $today = eightdigitdate(time);
my $today = '20161002';

print scalar <STDIN>;
print my @data = <STDIN>;

my $more = 1;
while($more)
  {
  for(@data)
    {
    my $date = (split)[1];
    if( $date < $today )
      {
      s/\b$date\b/ nextday($date) /e;
      print;
      }
    else
      {
      $more = 0;
      }
    }
  }

[perlforsgs]

F12 F11 F481 F55 F989 E1 E2 E3

8204 20160930 1064.848 test Y 10

8204A 20160930 1064.505 test Y 6 4

Thanks for all the help.Now things are getting lil more from previous.We have three more columns added E1,E2 ,E3.E3 doesnt have anything as off now .Just a placeholder. Now a new logic must be bulit for as below: F481 = IF (E2 NOT NULL) then (E1 - E2) / 2 ELSE (F481) So after computations the output must be as:

F12 F11 F481 F55 F989

8204 20160930 1064.848 test Y

8204A 20160930 1 test Y

The final output record format will be as per previous format .The first record meets the else part and hence remain unchanged . The second record gets computed as above.The new columns are never part of actual output