How do I save localstorage timestamp and get the difference?-CodePudding

I want to set localstorage' a timestamp. The time timestamp I set should be subtracted from the current time. What i want to do is a countdown

funcion setLocalStorage(){
           localStorage.setItem("countDown", new Date().toString());
                         }

funcion getLocalStorage(){
           return localStorage.getItem("countDown");
                         }

let diff = new Date() - getLocalStorage()

CodePudding user response：

localStorage.setItem("countDown", new Date().getTime());

then

let diff = new Date().getTime() - Number(getLocalStorage())

CodePudding user response：

function setLocalStorage() {
    localStorage.setItem("countDown", Date.now());
}

function getLocalStorage() {
    return localStorage.getItem("countDown");
}

let diff = Date.now() - getLocalStorage();