Well, actually the filetest operators compute their deltas against the value of $^T, which is initialized during startup. However, you may reset it if you think it's value might be getting stale: 
$^T = time();
$age = -M $file;

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-Blake

In reply to Re: Re: Answer: How do I interpret mtime with stat()? by blakem
in thread How do I interpret mtime with stat()? by Anonymous Monk

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