Grouping Data per Bulan SQLite

function rekapProduk(){
    db.transaction(function (tx) {
        var now = new Date();
        var today = now.getFullYear()+''+String('0'+(now.getMonth()+1)).substr(-2,2)+''+String('0'+now.getDate()).substr(-2,2);;
        now.setDate(now.getDate()+30);
        var bln1 = now.getFullYear()+''+String('0'+(now.getMonth()+1)).substr(-2,2)+''+String('0'+now.getDate()).substr(-2,2);
        now.setDate(now.getDate()+30);
        var bln2 = now.getFullYear()+''+String('0'+(now.getMonth()+1)).substr(-2,2)+''+String('0'+now.getDate()).substr(-2,2);
        now.setDate(now.getDate()+30);
        var bln3 = now.getFullYear()+''+String('0'+(now.getMonth()+1)).substr(-2,2)+''+String('0'+now.getDate()).substr(-2,2);
        now.setDate(now.getDate()+30);
        // var bln4 = now.getFullYear()+''+String('0'+(now.getMonth()+1)).substr(-2,2)+''+String('0'+now.getDate()).substr(-2,2);
        var batas = now.getFullYear()+'-'+String('0'+(now.getMonth()+1)).substr(-2,2)+'-'+String('0'+now.getDate()).substr(-2,2);

        tx.executeSql("SELECT kelas,deskripsi,qty,expired from products WHERE expired<='"+batas+"'", [], function(a,res){
            if (res.rows.length) {
                var data = {0:[], 1:[], 2:[], 3:[]/* , 4:[] */};
                var tglData;
                for (var i = 0; i < res.rows.length; i++) {
                    tglData = parseInt(res.rows.item(i).expired.replace(/-/g,''));
                    if(tglData<=parseInt(today)){
                        data[0].push(res.rows.item(i));
                    }else if(tglData>parseInt(today) && tglData<=parseInt(bln1)){
                        data[1].push(res.rows.item(i));
                    }else if(tglData>parseInt(bln1) && tglData<=parseInt(bln2)){
                        data[2].push(res.rows.item(i));
                    }else if(tglData>parseInt(bln2) && tglData<=parseInt(bln3)){
                        data[3].push(res.rows.item(i));
                    }
                }
                var table;
                // Expired (WO)
                if(data[0].length){
                    table = '<div class="data-table"><table><thead><tr><th class="label">Produk</th><th class="label">Qty</th><th class="label">Expired</th></tr></thead><tbody>';
                    $$.each(data[0], function(i, row){
                        table += '<tr><td class="label-cell"><strong>'+row.kelas+'</strong><br />'+row.deskripsi+'</td><td class="numeric-cell">'+row.qty+'</td><td class="label-cell">'+tanggal('j-M-Y',row.expired)+'</td></tr>';
                    });
                    table += '</tbody></table></div>';
                    $$('.data-expired-0').html(table);
                }else{
                    $$('.data-expired-0').html('<div class="pad">Tidak ada data</div>');
                }

                // Expired 1 bulan
                if(data[1].length){
                    table = '<div class="data-table"><table><thead><tr><th class="label">Produk</th><th class="label">Qty</th><th class="label">Expired</th></tr></thead><tbody>';
                    $$.each(data[1], function(i, row){
                        table += '<tr><td class="label-cell"><strong>'+row.kelas+'</strong><br />'+row.deskripsi+'</td><td class="numeric-cell">'+row.qty+'</td><td class="label-cell">'+tanggal('j-M-Y',row.expired)+'</td></tr>';
                    });
                    table += '</tbody></table></div>';
                    $$('.data-expired-1').html(table);
                }else{
                    $$('.data-expired-1').html('<div class="pad">Tidak ada data</div>');
                }

                // Expired 2 bulan
                if(data[2].length){
                    table = '<div class="data-table"><table><thead><tr><th class="label">Produk</th><th class="label">Qty</th><th class="label">Expired</th></tr></thead><tbody>';
                    $$.each(data[2], function(i, row){
                        table += '<tr><td class="label-cell"><strong>'+row.kelas+'</strong><br />'+row.deskripsi+'</td><td class="numeric-cell">'+row.qty+'</td><td class="label-cell">'+tanggal('j-M-Y',row.expired)+'</td></tr>';
                    });
                    table += '</tbody></table></div>';
                    $$('.data-expired-2').html(table);
                }else{
                    $$('.data-expired-2').html('<div class="pad">Tidak ada data</div>');
                }

                // Expired 3 bulan
                if(data[3].length){
                    table = '<div class="data-table"><table><thead><tr><th class="label">Produk</th><th class="label">Qty</th><th class="label">Expired</th></tr></thead><tbody>';
                    $$.each(data[3], function(i, row){
                        table += '<tr><td class="label-cell"><strong>'+row.kelas+'</strong><br />'+row.deskripsi+'</td><td class="numeric-cell">'+row.qty+'</td><td class="label-cell">'+tanggal('j-M-Y',row.expired)+'</td></tr>';
                    });
                    table += '</tbody></table></div>';
                    $$('.data-expired-3').html(table);
                }else{
                    $$('.data-expired-3').html('<div class="pad">Tidak ada data</div>');
                }

                dataNotifikasi();
            }else{
                $$('.data-expired-1,.data-expired-2,.data-expired-3').html('<div class="pad">Tidak ada data</div>');
            }
        });
    });
}