perl -MDate::Manip -e '@arr=("Aug 8 12:12:13","Jan 1 21:01:03",
"Aug 8 12:12:14","Aug 7 09:12:10");
print   map {$_->[0],"\n" } sort { $b->[1] <=> $a->[1] } 
map {my $c=ParseDateString($_);$c=~s/://g;[$_,$c]} @arr'

Aug 8 12:12:14
Aug 8 12:12:13
Aug 7 09:12:10
Jan 1 21:01:03