When do items in HTML5 local storage expire?

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I would suggest to store timestamp in the object you store in the localStorage

var object = {value: "value", timestamp: new Date().getTime()}
localStorage.setItem("key", JSON.stringify(object));

You can parse the object, get the timestamp and compare with the current Date, and if necessary, update the value of the object.

var object = JSON.parse(localStorage.getItem("key")),
    dateString = object.timestamp,
    now = new Date().getTime().toString();

compareTime(dateString, now); //to implement

Alternatively, you could use a light-weight wrapper like localstorage-slim.js which handles this for you.

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