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I have to transfer tokens from one account to another and I would like to associate a timestamp with that tokens so that i can identify which token was transferred on which time.

How do we write this code in a smart contract?

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You can just enrich your structure in order to store the timestamp.

Consider a simple mapping like this:

    mapping (address => uint256) public balanceOf;

to do something like you said would be enough to have a structure like this:

    struct Balance {
        uint amount;
        uint timestamp;
    }

    mapping (address => Balance) public balanceOf;

and structure your code accordingly in order to save the timestamp together with the amount.

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If you don't need the timestamp within the contract, you could just use the transaction block's timestamp. So whenever a token is transferred you can check in which block it was and check its timestamp.

But if you need to store the info in the contract itself then @mirg's answer will do.

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