Simple script to convert an ISO 1806 UTC datetime to a localized date time string on page load.

localize-datetime.js

const localizeDateTime = (function(){

    window.addEventListener('load', function(){
        const toLocalize = document.querySelectorAll('.localize-datetime');
        toLocalize.forEach(element => {
            let input = element.innerHTML;
            let date = new Date(input);
            element.innerHTML = `${date.toLocaleDateString()} ${date.toLocaleTimeString()}`
        });
    });

})();