queryNetwork_startTime - Cardano

Example code for the queryNetwork_startTime JSON-RPC method. Complete guide on how to use queryNetwork_startTime JSON-RPC in GetBlock Web3 documentation.

This method returns the UTC start time of the network, the moment the first block could have been produced. It is a fixed genesis constant.

Parameters

This method does not require parameters.

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "queryNetwork/startTime",
    "id": "getblock.io"
}'

JavaScript

example.js

const response = await fetch(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({"jsonrpc": "2.0", "method": "queryNetwork/startTime", "id": "getblock.io"})
    }
);
console.log(await response.json());

Python

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={"jsonrpc": "2.0", "method": "queryNetwork/startTime", "id": "getblock.io"}
)

print(response.json())

Response

{
    "jsonrpc": "2.0",
    "method": "queryNetwork/startTime",
    "result": "2017-09-23T21:44:51Z",
    "id": "getblock.io"
}

Response Parameters

Field	Type	Description
result	string	Network start time as an ISO 8601 UTC timestamp

Use Cases

• Slot Conversion: Convert absolute slots to wall-clock time

• Era Math: Anchor era-length calculations to genesis

• Display: Show the network's age on a status page

• Validation: Confirm the node is on the expected network by its start time

Error Handling

Error Code	Message	Description
-32602	Invalid params	A required field is missing or has the wrong type
-32000	Query unavailable	The query is not available in the current ledger era
-32603	Internal error	The node failed to answer the query