dateformat.js

window.onload = (event) => {
    const formatter = new Intl.DateTimeFormat('default', {
        weekday: 'short',
        year: 'numeric',
        month: 'long',
        day: 'numeric',
        hour: 'numeric',
        minute: 'numeric',
        second: 'numeric'
    });

    const elements = document.querySelectorAll("[data-timestamp]");
    for (let element of elements) {
        const date = new Date(parseInt(element.dataset.timestamp, 10) * 1000);
        element.innerHTML = formatter.format(date);
    }
};