In the [documentation](https://github.com/GoogleCloudPlatform/gcloud-node/blob/master/lib/storage/file.js#L905) _expiration_ is in seconds, but in [code](https://github.com/GoogleCloudPlatform/gcloud-node/blob/master/lib/storage/file.js#L950), it's expected to be in milliseconds. The given example use seconds.