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JavaScript

data = {
                "Contract": {
                        "30313760": {
                                "DateIns": "2020-10-06",
                                "Amount": 2300,
                                "Dogovor": "20100630313760",
                                "ProgramName": "Хеджфонд"
                        }
                },
                "req_state": "AN",
                "SOURCE": "INTERNETPARTPAYMENT",
                "DATE_CARD": "2020-08-27",
                "CRED_CARD": "Y",
                "idecb": "1004116510",
                "date_creat": "2020-08-26",
                "ref": "200826DO658C9841A8C7",
                "flag": "Y",
                "ContractCount": 1
        }





for(var i in data.Contract){
        if (data.Contract[i].DateIns>=data.date_creat) {
           if (data.Contract[i].ProgramName != 'Хеджфонд') {
        data.attracted='Y';
        break;
        }
}
  else {
        data.attracted='N';
         }       
}

console.log(data);