print Dumper $tot_start_date;
print Dumper $tot_end_date;
print Dumper $beta_start_date;
print Dumper $beta_end_date;
    
$tot_start_date = UnixDate($tot_start_date,"%Y-%m-%d");
$tot_end_date   = UnixDate($tot_end_date,"%Y-%m-%d");

$beta_start_date = UnixDate($beta_start_date,"%Y-%m-%d");
$beta_end_date   = UnixDate($beta_end_date,"%Y-%m-%d");
   
print Dumper $tot_start_date;
print Dumper $tot_end_date;
print Dumper $beta_start_date;
print Dumper $beta_end_date;


And here is the output:

$VAR1 = '2008-06-27 17:37:11 +0000';
$VAR1 = '2008-09-29 04:02:18 +0000';
$VAR1 = '2008-09-29 04:02:18 +0000';
$VAR1 = '2009-01-07 00:00:00 -0800';

$VAR1 = '2008-06-27';
$VAR1 = '2008-09-28';
$VAR1 = '2008-09-28';
$VAR1 = '2009-01-07';