clock.js

function jikan() {
    let d = new Date();

    let year = d.getFullYear();
    let month = ("00" + (d.getMonth() + 1)).slice(-2);
    let day_k = ("00" + d.getDate()).slice(-2);
    let hours = ("00" + d.getHours()).slice(-2);
    let minutes = ("00" + d.getMinutes()).slice(-2);
    let seconds = ("00" + d.getSeconds()).slice(-2);
    let youbi_k = d.getDay()
    const youbi_list = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
    let youbi = youbi_list[youbi_k]
    let day = year + " : " + month + "," + day_k + "," + hours + ":" + minutes + ":" + seconds;
    document.getElementById('clock').innerHTML = day;
    document.getElementById('day').innerHTML = youbi;
}
window.onload = jikan();
setInterval(jikan, 1000);

function copy() {

    let clock = document.getElementsByClassName('clock')[0];
    let day = document.getElementById('day');
    let coppybutton = document.getElementById('copybutton');
    clock.className = "copy_clock_data";
    clock.selected = true;
    coppybutton.id = "align_center_button";
    if (navigator.clipboard) {
        navigator.clipboard.writeText(clock.textContent.slice(0, 13) + " " + day.textContent + ", " + clock.textContent.slice(13));
    }
    coppybutton.innerHTML = "copy ✓";
    let crock = document.getElementsByClassName('copy_clock_data')[0];
    crock.className = "clock";
    setTimeout(() => {
        coppybutton.innerHTML = "copy";
        document.getElementById('align_center_button').id = "copybutton";
    }, 1500);

}
window.onload = () => {
    document.oncontextmenu = () => {return false;}
    document.addEventListener('keydown', () => {
        if (event.keyCode == 123) {
            event.preventDefault();
            }
        if (event.shiftKey == true) {
            if (event.ctrlKey == true) {
                if (event.keyCode == 74 || event.keyCode == 73) {
                    event.preventDefault();
                    }
                }
            }
    });
}