stime man page
stime — set time
int stime(const time_t *t);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.19:
Glibc 2.19 and earlier:
stime() sets the system's idea of the time and date. The time, pointed to by t, is measured in seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). stime() may be executed only by the superuser.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
Error in getting information from user space.
The calling process has insufficient privilege. Under Linux, the CAP_SYS_TIME privilege is required.
date(1), settimeofday(2), capabilities(7)
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capabilities(7), explain(1), explain(3), explain_stime(3), explain_stime_or_die(3), rtc(4), syscalls(2).