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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

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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.

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    Using a block number won't stop miners from making the thing fast-forward, as if they mess with timestamps the difficulty will adjust to make the blocks faster. Beyond very short timespans, if you want a time, use a timestamp. – Edmund Edgar Oct 17 '17 at 3:55

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