to_f

/*
 *  call-seq:
 *     time.to_f => float
 *  
 *  Returns the value of <i>time</i> as a floating point number of
 *  seconds since epoch.
 *     
 *     t = Time.now
 *     "%10.5f" % t.to_f   #=> "1049896564.13654"
 *     t.to_i              #=> 1049896564
 */

static VALUE
time_to_f(time)
    VALUE time;
{
    struct time_object *tobj;

    GetTimeval(time, tobj);
    return rb_float_new((double)tobj->tv.tv_sec+(double)tobj->tv.tv_usec/1e6);
}