DIFFTIME Section: Linux Programmer's Manual (3) Updated: July 2, 2025 Index   NAME difftime - calculate time difference   SYNOPSIS #include <time.h> double difftime(time_t time1, time_t time0);   DESCRIPTION The difftime() function returns the number of seconds elapsed between time time1 and time time0. The two times are specified in calendar time, which represents the time elapsed since 00:00:00 on January 1, 1970, Coordinated Universal Time (UTC).   CONFORMING TO SVID 3, BSD 4.3, ISO 9899   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:02 GMT, March 24, 2025