Ethereum Block by HEX Day

ethereumBlockHEX.js

// https://codeakk.medium.com/hex-development-data-a1b1822446fa
// https://togosh.medium.com/hex-developer-guide-3b018a943a55

test();

async function test(){
  var blockNumber = await getEthereumBlock(622);
  console.log("Ethereum Block Number: " + Number(blockNumber).toLocaleString(undefined, {minimumFractionDigits:0, maximumFractionDigits:0}));
}

async function getEthereumBlock(day){
  var startTime = 1575417600 + ((day - 2) * 86400);
  return await fetch('https://api.thegraph.com/subgraphs/name/blocklytics/ethereum-blocks', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ query: `
      query {
        blocks(
          first: 1, 
          orderBy: timestamp, 
          orderDirection: asc, 
          where: {
            timestamp_gt: ` + startTime + `
          }
        ){
          id
          number
          timestamp
        }
      }` 
    }),
  })
  .then(res => res.json())
  .then(res => {
    var block = res.data.blocks[0];
    return block.number;
  });
}