How to convert 7 digit timestamp in php?

Question

I am working on an API and I get the below response. It's basecamp 3 API.

[
   'access_token' => 'BAhbB0kiAbB7ImNsaWVudF9pZCI6ImUxZTk1NTYxMzdlZDIwYTQzZGEyYjk4NGU1NWEyYjM4Y2ExNWRlODQi'
   'expires_in' => 1209600
]

I don't know to which kind of date format expires_in belongs. I want to convert this timestamp to a standard DateTime string like below.

Required Format

1209600 => 2018-06-23 14:09:01

Answer 1

What gets passed in expires_in is the interval of token validity in seconds. 1209600 in your example is equal to 14 days (1209600 / (3600 * 24)).

Here's one possible approach to convert this into real date:

$value = 1209600;
$date = new DateTime();
$date->add(DateInterval::createFromDateString( $value . ' seconds') );
echo $date->format('Y-m-d H:i:s');