JSFiddle - React, Tailwind, and code Playground

JavaScript

var str="2012-03-23 00:00:00";

function convert(a){
    a=a.split(' ')[0].split('-');
    var ret=[];
    for(var i=a.length;0<=--i;){
        ret.push(1===i?parseInt(a[i],10):a[i])
    }
    return ret.join('/');
}

alert(convert(str));