Question

Rails provides a timestamp like follows: 2012-12-21T01:09:32Z

How can I use JavaScript to determine how many days old the timestamp is?

Thanks

Answer 1

You can use new Date('2012-12-21T01:09:32Z') to turn the string into a Date object. Then use simple arithmetic:

var dateStr = '2012-12-21T01:09:32Z',
daysAgo = (new Date() - new Date(dateStr)) / 86400 / 1000;

if (daysAgo > 7) {
    // more than 7 days ago
}

You may want to use Math.floor(daysAgo) or Math.ceil(daysAgo) to round the results down or up, depending on your situation.