Does timestamp also change with nonce to calculate block hash in blockchain How hash is calculated

Question

Do we need to update date timestamp on every hash calculation update and also could someone explain how it's implemented in most popular cryptocurrencies?

function isValidHashDifficulty() { //validate calculated hash to fit requirements } function calculateHash(nextIndex, previousHash, timestamp, data, nonce) { //calculate hash } let nonce = 0; let nextIndex, previousHash, data; let timestamp = new Date().getTime(); // do we use this timestamp? while (!isValidHashDifficulty(nextHash)) { nonce = nonce + 1; timestamp = new Date().getTime(); //or do we get new date on every calculation attempt? nextHash = calculateHash(nextIndex, previousHash, timestamp, data, nonce); }