os.difftime (t2, t1)

Returns the number of seconds from time t1 to time t2. In POSIX, Windows, and some other systems, this value is exactly t2-t1.

EVERYTHING
Operating System Facilities
os.clock•
os.date•
os.difftime•
os.execute•
os.exit•
os.getenv•
os.remove•
os.rename•
os.setlocale•
os.time•
os.tmpname•

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