As previously mentioned, I don't think leap seconds matter with time. In any case, I'm talking of the days with 23*60*60 seconds and the days with 25*60*60 seconds.

Previously written example: 

# Set your timezone to America/New_York before running.
# In this time zone, DST ends on Nov 2, 2008 at 2:00 AM.

# "Sets" the current time to 5 seconds past midnight on Oct 28, 2008.
use Time::Local qw( timelocal );
my $time = timelocal(5,0,0,28,10-1,2008);

use POSIX;
print( strftime( "%m-%d\n", localtime( (24*60*60) * $_ + $time ) ) )
   for 1..30;

[download]

Output 

10-29
10-30
10-31
11-01
11-02   \ 11-02 seen twice
11-02   /
11-03
11-04
11-05
11-06
11-07
11-08
11-09
11-10
11-11
11-12
11-13
11-14
11-15
11-16
11-17
11-18
11-19
11-20
11-21
11-22
11-23
11-24
11-25
11-26
       > 11-27 never seen

[download]

You don't need any inefficient code to do it right, so you might as well do it right. Sewi showed a way that will probably always work. The following will always work: 

use Time::Local qw( timegm );
use POSIX qw( strftime );
my $date = timegm(localtime);
$date += 24*60*60;
print(strftime("%Y%m%d\n", gmtime($date)));

[download]

GMT always has 24*60*60 seconds per day. Note the result is still local time.

In reply to Re^4: Date Time problem. by ikegami
in thread Date Time problem. by Karger78

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