How Do You Programmatically Set the Hardware Clock on Linux?
Check out the rtc man-page for details, but if you are logged in as root, something like this:
#include <linux/rtc.h>#include <sys/ioctl.h> struct rtc_time { int tm_sec; int tm_min; int tm_hour; int tm_mday; int tm_mon; int tm_year; int tm_wday; /* unused */ int tm_yday; /* unused */ int tm_isdst;/* unused */ };int fd;struct rtc_time rt;/* set your values here */fd = open("/dev/rtc", O_RDONLY);ioctl(fd, RTC_SET_TIME, &rt);close(fd);