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const data= {

    "appName": "esa",
  
    "clientId": "administrator",
  
    "host": "este-rpc-host",
  
    "parameters": [
  
      "15000",
  
      "2021-01-01T00:00:00Z",
  
      "2021-12-31T00:00:00Z",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900",
  
      "01-01-1900"
  
    ],
  
    "password": "welcome",
  
    "rpcName": "sap_prod_upd",
  
    "userId": "127.30.93.198"
  
  }



var regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/gm;
var message = data;




for (const key of Object.keys(data)) {
  if(key ==="parameters"){
    console.log(key, data[key]);
    for(let datum in data[key]){
      var regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/gm
      if(data[key][datum].match(regex)){
        data[key][datum] = convertdate(data[key][datum])
      }
      
      
    }
  }
  
}

function convertdate(word){
    var temp = word.slice(0,word.indexOf("T")).split("-");
    var date = ""+temp[2]+"-"+temp[1]+"-"+temp[0];
    return date
  
}

console.log((data))