{
$begin = add_months($from, -12);
$end = add_months($to, -12);
+ if (date_comp($to, end_month($to)) == 0) // compensate for leap years. If to-date equal end month
+ $end = end_month($end); // then the year-1 should also be end month
$headers[3] = _('Period Y-1');
}