javascript - What are the units of FB.getAuthResponse().expiresIn?

When I do this in the Facebook JavaScript API:

FB.getLoginStatus(function(response) {
    console.log(response.authResponse.expiresIn);
});

I get back an integer like 5184000.

When is that? What are the units? What's the epoch? It's clearly not in milliseconds since 1970. How do I convert that to a Date in JavaScript?

When I do this in the Facebook JavaScript API:

FB.getLoginStatus(function(response) {
    console.log(response.authResponse.expiresIn);
});

I get back an integer like 5184000.

When is that? What are the units? What's the epoch? It's clearly not in milliseconds since 1970. How do I convert that to a Date in JavaScript?

Share Improve this question asked May 28, 2012 at 5:50 Dan Fabulich 39.6k42 gold badges145 silver badges184 bronze badges

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2 Answers 2

Sorted by: Reset to default 9

It is the time of expiry in seconds. It is equivalent to 60 days.

In order to convert to a date read here.

According to the doc, some years later, it may have changed:

expiresIn

A UNIX time stamp when the token expires. Once the token expires, the person will need to login again.

https://developers.facebook./docs/facebook-login/web/