appe receipt validation api return wrong purchase time

my db record time is 2021-06-08 17:49😮 0 China/Beijing but receipt validation returned 2021-06-08 10:48:11 America/Los_Angeles; transaction info :

{
            "quantity": "1",
            "product_id": "1001",
            "transaction_id": "590000729122799",
            "original_transaction_id": "590000711707477",
            "purchase_date": "2021-06-08 17:48:11 Etc/GMT",
            "purchase_date_ms": "1623174491000",
            "purchase_date_pst": "2021-06-08 10:48:11 America/Los_Angeles",
        }

"bundle_id": "cn.izdax.tv.izdaxtv",

timestamp: 1623174491000 convert to beijing time is 2021-06-09 01:48:11 China/Beijing, I believe there has some time issue;

appe receipt validation api return wrong purchase time
 
 
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