How to specify a date when the function will be available for calling?

Question

I have not figured out yet how to open NFT minting after specific date. For example, if I deploy my smart contract right now, I want users to be able to mint NFT's starting from 1st January of 2022.

I came across block.timestamp, but I can't figure out a way how to use it.

Or would it to be better to just deploy the contract on 1st January?

Answer 1

block.timestamp is a global variable returning the time of the block when the function is executed (by sending a transaction). Or the current time if the function is called (by performing a read-only call).

pragma solidity ^0.8;

contract MyContract {
    function mint() external {
        require(block.timestamp >= 1640995200, "Not yet available");
        // ... rest of your code
    }
}