How to display data value from web sql

I'm trying to insert current date and time into web-sql, then I want to display that current date and time in list page. How?

I'm using document.getElementById('tbh_tgl').value=(today+now), tambah_tgl(); to enter the date and time

Setting format date and time

var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!
var yyyy = today.getFullYear();
var hh = today.getHours();
var mn = today.getMinutes();
if(dd<10) {
    dd='0'+dd
} 

if(mm<10) {
    mm='0'+mm
} 
if(hh<10) {
    hh='0'+hh
}
if(mn<10) {
    mn='0'+mn
}
today = dd+'-'+mm+'-'+yyyy;
var now = ' '+hh+':'+mn;

Function for insert data

function tambah_tgl(){
    if(mydb){
         var tgl = document.getElementById('tbh_tgl').value;
            mydb.transaction(function (t) {
                t.executeSql("INSERT INTO history (tanggal) VALUES (?)", [tgl]);
            });
    } 
    else 
    {
        alert("database not found, browser not support web sql!");
    }
}

I want to display data in here (list page):

<li class="list-item">
 <div class="list-item__center">
   <p id="tbh_tgl"></p>
 </div>
</li>

The data doesn't show up here

The text inside a <p> element is not in element.value but element.textContent.

document.getElementById('tbh_tgl').textContent = (today+now)

var tgl = document.getElementById('tbh_tgl').textContent