ref: 994751d39485e086ef623f202fb1b84729fd5d19
dir: /doc/man3/difftime.3/
.TH DIFFTIME 3 .SH NAME difftime - calculate time difference .SH SYNOPSIS #include <time.h> double difftime(time_t time1, time_t time0) .SH DESCRIPTION The .BR difftime () function returns the difference (time1 - time0) between time .I time1 and time .IR time0 . .SH RETURN VALUE The value returned is the number of seconds elapsed, represented as a double. .SH STANDARDS ISO/IEC 9899:1999 Section 7.23.2.2 Paragraph 1,2,3 .SH SEE ALSO .BR time.h (3)