localtime

/*
 *  call-seq:
 *     time.localtime => time
 *  
 *  Converts <i>time</i> to local time (using the local time zone in
 *  effect for this process) modifying the receiver.
 *     
 *     t = Time.gm(2000, "jan", 1, 20, 15, 1)
 *     t.gmt?        #=> true
 *     t.localtime   #=> Sat Jan 01 14:15:01 CST 2000
 *     t.gmt?        #=> false
 */

static VALUE
time_localtime(time)
    VALUE time;
{
    struct time_object *tobj;
    struct tm *tm_tmp;
    time_t t;

    GetTimeval(time, tobj);
    if (!tobj->gmt) {
        if (tobj->tm_got)
            return time;
    }
    else {
        time_modify(time);
    }
    t = tobj->tv.tv_sec;
    tm_tmp = localtime(&t);
    if (!tm_tmp)
        rb_raise(rb_eArgError, "localtime error");
    tobj->tm = *tm_tmp;
    tobj->tm_got = 1;
    tobj->gmt = 0;
    return time;
}