#!/usr/bin/perl
use strict;
use warnings;

use DateTime;
use DateTime::Format::Strptime;

my $file = $ARGV[0] or die "Need to get CSV file on the command line\n";
my $outfile  = "output_date.txt";

my $sum = 0;
open(my $data, '<', $file) or die "Could not open '$file' $!\n";
open (OUTFILE, "> $outfile") || die "ERROR: opening $outfile\n";

 
while (my $line = <$data>) {
  chomp $line;
  
  my @fields = split "\t" , $line, -1;;
		my $formatter= new DateTime::Format::Strptime(pattern => '%Y%m%d%T');
		

  		my $sum1 = "$formatter->parse_datetime($fields[2])";
		my $sum2 =  "$formatter->parse_datetime($fields[3])";
  		  $fields[2] = "$sum1";
		$fields[3] = "$sum2";
		# $line= print join( "\t", @fields ) . "\n" ;
		print OUTFILE "@fields\n";
}
close ($data);
close (OUTFILE);