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  1. or download this
            use DB_File; 
        tie my %cache => 'DB_File', $filename, O_RDWR|O_CREAT, 0666;
        memoize 'function', SCALAR_CACHE => [HASH => \%cache];
  2. or download this
    ___
-DA
> perl -MPOSIX -e'$ENV{TZ}="US/Eastern";print ctime(10**9)'
Sat Sep  8 21:46:40 2001