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  1. or download this
    #!/usr/bin/perl
use strict;
...

$ perl sample.pl
diff secs: 120
  2. or download this
    exact    : an exact, non-business calculation
semi     : a semi-exact, non-business calculation
...
business : an exact, business calculation
bsemi    : a semi-exact, business calculation
bapprox  : an approximate, business calculation