julian_adj
if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))