omul
r = oadd(omul(hh, sign * SECSPERHOUR), sign * (mm * SECSPERMIN + ss));
omul(r, 4);
t = omul(dayoff, SECSPERDAY);
static zic_t omul(zic_t, zic_t);
dayoff = omul ((wantedy / YEARSPERREPEAT - y / YEARSPERREPEAT
t = omul(dayoff, SECSPERDAY);