jd()
public
Returns the Julian day number. This is a
whole number, which is adjusted by the offset as the local time.
DateTime.new(2001,2,3,4,5,6,'+7').jd
DateTime.new(2001,2,3,4,5,6,'-7').jd
static VALUE
d_lite_jd(VALUE self)
{
get_d1(self);
return m_real_local_jd(dat);
}