How to get expiry date of a Non-renewing subscription

Question

I want to know how to check non-renewing subscription expiration for iOS7.

While doing receipt validation Iam getting SubExpDate = ""; After successful receipt validation I am getting data as

        CancelDate = "";
        OriginalPurchaseDate = "2015-04-17T09:56:14Z";

        OriginalTransactionIdentifier =
        ProductIdentifier = ;
        PurchaseDate = "2015-04-22T05:46:55Z";
        Quantity = 1;
        SubExpDate = "";
        TransactionIdentifier =;
        WebItemId = 0;

How to calculate expiry date? Any help to proceed?

Answer 1

Based on This documentation the receipt will never return the expiry date. Therefor you need to calculate it yourself. You can either create a backend service that keep the record of each product expiration duration or embed it directly in your app.