Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.18+commit.87f61d96.js&optimize=false&runs=200&gist=

contracts-gist...permit2.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

interface IERC20 {
    function transfer(address to, uint256 amount) external returns (bool);
}

interface IPermit2 {
    struct TokenPermissions {
        // Token to transfer.
        IERC20 token;
        // Amount to transfer.
        uint256 amount;
    }

    // The permit2 message.
    struct PermitTransferFrom {
        // Permitted token and amount.
        TokenPermissions permitted;
        // Unique identifier for this permit.
        uint256 nonce;
        // Expiration for this permit.
        uint256 deadline;
    }

    // Transfer details for permitTransferFrom().
    struct SignatureTransferDetails {
        // Recipient of tokens.
        address to;
        // Amount to transfer.
        uint256 requestedAmount;
    }

    // Consume a permit2 message and transfer tokens.
    function permitTransferFrom(
        PermitTransferFrom calldata permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;
}

contract Permit2Clone is IPermit2 {
    constructor() {
        bytes memory bytecode = hex"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        assembly {
            return(add(bytecode, 32), mload(bytecode))
        }
    }

    function DOMAIN_SEPARATOR() external view returns (bytes32) {}

    function permitTransferFrom(
        PermitTransferFrom calldata permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external {}
}

contracts-gist...Savings.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.2 <0.9.0;

import {IPermit2} from "./permit2.sol";
import {IERC20} from "./permit2.sol";

contract Savings {
    IPermit2 public permit2;
    uint256 withdrawTimestamp;

    mapping(address user => mapping(IERC20 token => uint256 amt)) public usersTokenBalance;

    constructor(IPermit2 _permit2) {
        permit2 = _permit2;
        withdrawTimestamp = block.timestamp + 1 minutes;
    }

    function depositERC20Token(
        IERC20 _token,
        uint256 _amount,
        uint256 _nonce,
        uint256 _deadline,
        bytes calldata _sig
    ) external {
        usersTokenBalance[msg.sender][_token] += _amount;
        permit2.permitTransferFrom(
            IPermit2.PermitTransferFrom({
                permitted: IPermit2.TokenPermissions({
                    token: _token,
                    amount: _amount
                }),
                nonce: _nonce,
                deadline: _deadline
            }),
            IPermit2.SignatureTransferDetails({
                to: address(this),
                requestedAmount: _amount
            }),
            msg.sender,
            _sig
        );
    }

    function withdrawSavings(IERC20 _token, uint256 _amount) external {
        require(block.timestamp >= withdrawTimestamp, "withdraw time not ellapsed");
        usersTokenBalance[msg.sender][_token] -= _amount;
        _token.transfer(msg.sender, _amount);
    }


}

contracts-gist...SignPermit.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

import "./permit2.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

contract SignPermit {
    Permit2Clone permit2;

    bytes32 constant TOKEN_PERMISSIONS_TYPEHASH =
        keccak256("TokenPermissions(address token,uint256 amount)");
    bytes32 constant PERMIT_TRANSFER_FROM_TYPEHASH = 
        keccak256("PermitTransferFrom(TokenPermissions permitted,address spender,uint256 nonce,uint256 deadline)TokenPermissions(address token,uint256 amount)");

    constructor(Permit2Clone _permit2) {
        permit2 = _permit2;
    }
    function _getEIP712Hash(IPermit2.PermitTransferFrom memory permit, address spender)
        external
        view
        returns (bytes32 hash)
    {
        return keccak256(abi.encodePacked(
            "\x19\x01",
            permit2.DOMAIN_SEPARATOR(),
            keccak256(abi.encode(
                PERMIT_TRANSFER_FROM_TYPEHASH,
                keccak256(abi.encode(
                    TOKEN_PERMISSIONS_TYPEHASH,
                    permit.permitted.token,
                    permit.permitted.amount
                )),
                spender,
                permit.nonce,
                permit.deadline
            ))
        ));
    }

    function getTimestamp() external view returns(uint256) {
        return block.timestamp + 10 minutes;
    }

    function timestamp() external view returns(uint256) {
        return block.timestamp;
    }

    function chainid() external view returns(uint256) {
        return block.timestamp;
    }

    function domainSep() external view returns(bytes32) {
        return permit2.DOMAIN_SEPARATOR();
    }
}

contracts-gist...TestToken.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.2 <0.9.0;

import {ERC20} from "https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol";

contract TestToken is ERC20 {
    constructor() ERC20("Test", "TT", 18){}

    function mint(address owner, uint256 amount) external {
        _mint(owner, amount);
    }
}