I think perhaps your confusion was with the number format. You can use the underscore as a noop separator for numbers. So while 86400 might be written as 86.400 in some locales and 86,400 in others, in a perl script you can write 86_400. This is supposed to make really long numbers easier to parse for humans.
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. -- Brian W. Kernighan
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