Not elegant, but it works: put the initial timestamp in
a file called timestamp.txt. Then run the following subroutine
on it... the first block reads in the timestamp, the last
block writes it back out, and you add a day's worth of seconds
in between.
#!/usr/bin/perl
use warnings;
use strict;
sub add_one_day {
my $timestamp_file = 'timestamp.txt';
open my $read_fh, '<', $timestamp_file;
chomp ( my $timestamp = <$read_fh> );
close $read_fh;
$timestamp += 86400;
open my $write_fh, '>', $timestamp_file;
print $write_fh "$timestamp\n";
close $write_fh;
}
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