Who want help this problem error " The expiry date is in the past please set it in the Future"?

I think error in "webIntFramework" plugin in file webintframework/lib/wi_shared.php in this code

function wi_check_date_not_past($new_date){
 
    $today = date('Y-m-d');    
    
    if($new_date >= $today){
        return true;
    }
    else{
        return false;
    }
}
 
 
function wi_check_if_today($new_date){
    
    $today = date('Y-m-d');    
    echo $today;
    if($new_date == $today){
        return true;
    }
    else{
        return false;
    }
}
 
function wi_check_date_format($str){
 
    if(substr_count($str, "-")==2){
        
        list ($y, $m, $d) = explode('-', $str);
        
        if(!is_numeric($y) || !is_numeric($m) || !is_numeric($d)){
            return false;
        }
        return checkdate($m, $d, $y);
    }
    else{
        return false;
    }
}
 
what do you think?