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;
}

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;
}