[i4w_set nextmonth="[i4w_exec]
$a = [i4w_date format='m'];
$b = 1;
$c = $a + $b;
echo $c;
[/i4w_exec]"]
[i4w_set nextyear="[i4w_exec]
$a = [i4w_date format='Y'];
$b = 1;
$c = $a + $b;
echo $c;
[/i4w_exec]"]
[i4w_compare value1='{:nextmonth:}' cmp='LT' value2='13']
[i4w_date format='{:nextmonth:}/01/Y 00:00:00']
[ELSE_compare]
[i4w_date format='1/01/{:nextyear:} 00:00:00']
[/i4w_compare]