C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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difftime
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The difftime function computes the difference between the supplied
     time values <timer0> and <timer1>.
 
     Return Value
 
     The difftime function returns the elapsed time, in seconds, from
     <timer0> to <timer1>. The value is returned as a double-precision
     number.
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