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    for($i = $self->{'Count'}; $i > 1; $i--) {
        $j = $i - 1;
...
                or croak "error: move failed: ($prev,$next)";
        }
    }

use POSIX qw(strftime);
@t = localtime;
...
print strftime("%Y%m%d-%H%M%S",     @t); # logfile_20040914-151753
print strftime("%Y-%m-%d-%H%M%S",   @t); # logfile_2004-09-14-151753
print strftime("%Y-%m-%d@%H-%M-%S", @t); # logfile_2004-09-14@15-17-53