I have following struct on my contract :

 struct Token {
        address tokenAddress;
        uint256 stakedAmount;
        bool isUsed;
        uint256 lastTransactionDate;

It is used on following mapping :

mapping(address => mapping(address => Token)) public _stakingUserBalance

Each time user is stacking, I update stakedAmount with an amount and lastTransactionDate with block.timestamp.

In order to compute rewards, I need to know if stacking is more than 1 day. But I'm not sure to understand correctly unix timestamp process.

Is it a way to convert lastTransactionDate to a readable date, and compare with the moment of computing reward ?

Thanks for your help.

1 Answer 1


I had a similar issue, solved it with a function that refreshes time limit to zero if conditions are met.

First you need to create your own constant variable DAY,

uint constant DAY = 60 * 60 * 24; // Number of seconds in a day

 * Refreshes the transfer limit of the given address if it has been more than 24h since it last sent funds.
function refreshTimeLimit(address addr, address tokenAddress) public {
    if (block.timestamp - _stakingUserBalance[addr].Token[tokenAddress].transactionTime > DAY) {
        _stakingUserBalance[addr].Token[tokenAddress].lastTransactionDate = block.timestamp;
        _stakingUserBalance[addr].Token[tokenAddress].stakedAmount = 0;

 * Returns the time/date of the last transaction from this address.
function transactionTime(address addr, address tokenAddress) public view returns (uint){
    return  _stakingUserBalance[addr].Token[tokenAddress].lastTransactionDate;

 * Returns the amount that had been stacked from the address in the last 24h.
function stakedSum(address addr, address tokenAddress) public view returns (uint){
    return _stakingUserBalance[addr].Token[tokenAddress].stakedAmount;
  • Note: my mapping had been different, and I didn't had time to fully edit the code. But the concept is there.
    – Sky
    Jan 20, 2022 at 11:34

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