How to prevent token transfer until certain day in my smart contract

Question

I have made this smart contract test, but I need to add the function to prevent any wallet to transfer token until the first of January of 2018.

What would be the code needed to achieve this?

Thanks

Answer 1

To prevent token transfer you have to add online of code in transfer and transferfrom function. require(now > 1514764800) This will check either the time was greater than Jan 01 2018 00:00:00 GMT or not, If it was greater than the specified time it will enable the function else it won't.

The disadvantage of adding a timestamp in the conditional statement is miners can fork the time. So if you are more concern about security add block number instead of timestamp.

function transfer( address _to, uint _value) public {
  require( now > 1514764800 );
  /* Rest of Function */
}

You can convert timestamp here.