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STIME(2) System Calls Manual STIME(2)

stime - set time

stime(tp)
long *tp;

Stime sets the system's idea of the time and date. Time, pointed to by tp, is measured in seconds from 0000 GMT Jan 1, 1970. Only the super-user may use this call.

date(1), time(2), ctime(3)

Zero is returned if the time was set; -1 if user is not the super-user.

(stime = 25.)
(time in r0-r1)
sys stime

UNIX-7