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$ ./2.strftime.pl 
It took me 10 seconds
I was started on 2019-12-03 11:41:38 and ended on 2019-12-03 11:41:48
$ cat 2.strftime.pl

#!/usr/bin/perl
use strict;
use warnings;
...
my $start_date = strftime "%Y-%m-%d %H:%M:%S",(localtime($start));
my $end_date   = strftime "%Y-%m-%d %H:%M:%S",(localtime($end));
print "I was started on $start_date and ended on $end_date\n";