contract.sol

pragma solidity >=0.4.22 <0.7.0;

// "SPDX-License-Identifier: UNLICENSED"

contract MainContract{

    address owner;
    uint256 public dataCounter;
    mapping(uint256=>uint256[]) public dataList; // dataId -> Data
    mapping(string=>uint256) public timeToData; // time in string format -> Data

    constructor() public payable{
        owner = msg.sender;
        dataCounter = 0;
    }

    function createData(string memory _time, uint256[] memory _datas) public payable returns(uint256) {
        timeToData[_time] = dataCounter;
        dataList[dataCounter] = _datas;
        dataCounter++;
        return dataCounter-1;
    }

    function getData(uint256 _dataId) public view returns(uint256[] memory){
        return dataList[_dataId];
    }

    function getLatestData() public view returns(uint256[] memory){
        return dataList[dataCounter-1];
    }

    function getDataId(string memory _time) public view returns (uint256){
        return timeToData[_time];
    }

}