Sometime we need to apply time base restrictions for special offer or ICO. Below, is the example for timebase restriction.

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract timeBaseRistriction{
    
    uint creationTime = block.timestamp;
    
    uint maxtime = creationTime + 1 minutes;
    
    modifier timeLimit(uint _time){
        if(block.timestamp < _time)
        revert("Time restriction");
        
        _;
    }
    
    //this method to able called after 2 minute 
    function call1() public payable timeLimit(maxtime){
        
    }
    //this method to able called after 3 minute
    function call2()public payable timeLimit(maxtime + 2 minutes){
        
    }
    
    function getBalance()public view returns(uint){
        return address(this).balance;
    } 
}