I want my Javascript to expire in 30 days

Question

I'm looking for some code which can check whether 30 days have passed, and if so the script will stop working; if not, it calls the start() function.

I only need to do it in Javascript.

var date = 11;
var month = 10;
var year = 2012;

function Checkday() {
    if ( // check 30 days ) {
        start();
    } else {
        stop();
    };
};

I'm also wondering whether there is a way to add PHP code in a JS file. I know this is a stupid question but I'm just curious.

Thanks in advance.

Edited:

We will be selling the JS file so we will be setting the date in the JS file. So we want it to check the expiry time and stop functioning.

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date — Marc B, Oct 12 '12 at 04:08
@MarcB. Expire javascript, Ohh, people have imagination now days... — gdoron, Oct 12 '12 at 04:16
duplicate: http://stackoverflow.com/questions/1210701/compute-elapsed-time-in-javascript — RASG, Oct 12 '12 at 04:18
yes its for selling and will be setting date in js file. no need for cookie and all — deerox, Oct 12 '12 at 04:19
When you sell the JS file...the person will have complete access to it. Even if your idea wasn't riddled with flaws: they could just remove that piece of the code that makes it stop working. — Rhyono, Oct 12 '12 at 04:23
yes but every one cant do it. its 50-50. all cant change setting and we have nice js packer — deerox, Oct 12 '12 at 04:24
@MarcB. Doesn't know js but want to sell js. Funny how things work... — gdoron, Oct 12 '12 at 04:30
@deerox You don't sell things with a 50-50 chance of working... do you? — loxxy, Oct 12 '12 at 04:31
@deerox: there is no js packer that can't be bypassed. just because you can't doesn't mean no one else can either. — Marc B, Oct 12 '12 at 04:32

sics · Answer 1 · 2012-10-12T04:37:55.650

I've made a fiddle for you.

var date = 10;
var month = 10;
var year = 2012;

var expires = new Date(year, month, date);
function checkDate() {
    var d = new Date();
    return(d>expires);
}

Give your js file the ending .php and put header('content-type: application/x-javascript'); at the beginning of it. Now you can <?php echo $variables; ?> inside of it. This workouround must not work in ie*.

Nevertheless: if you're selling the js and want to stop this function when a given timepoint is reached: This is not solvable via javascript! Anybody could edit a javascript file - like the date, month, year params. Except you hava a js packer, which - IMHO - is not safe enough.

You can do: `new Date(year, month, date);`... probably better. — MiniGod, Oct 12 '12 at 04:33

score 2 · Accepted Answer · answered Oct 12 '12 at 04:25

2

This might help you..

var date = 11;
var month = 10;
var year = 2012

function Checkday() {
    if ( !isExpired() ) {
        start();
        } else {
        stop();
    };
};

function isExpired() {

    var current = new Date(); 
    current = current.getTime(); 

    var dateToCheck = new Date(); 
    dateToCheck.setFullYear(year); 
    dateToCheck.setMonth(month); 
    dateToCheck.setDate(date + 30) 
    var checkdate = dateToCheck.getTime();

    return checkdate < current
}

answered Oct 12 '12 at 04:25

Chand

91
4

Problem is taking computer time. How to make it gmtime – deerox Oct 12 '12 at 05:17
this link will help you, http://www.w3schools.com/jsref/jsref_obj_date.asp it has all the functions available in date – Chand Oct 12 '12 at 05:45

score 2 · Answer 3 · answered Oct 12 '12 at 04:25

2

Silly question, but what is to stop the people you are selling this JavaScript file to from opening it up themselves and changing the date? Are you selling this file to them so they can use it in their website? I have to imagine that they will be smart enough to think of that.

Also, php is a server-side language while JavaScript is a client-side language, so putting php in the JS file directly wouldn't do you much good. Really your best bet is to save the dateinfo in a cookie and check it before calling the function.

answered Oct 12 '12 at 04:25

Craine

490
8
17

we have nice packer and it will be added on addon on firefox. – deerox Oct 12 '12 at 04:37
i know php is server side language but as answer above i have to end up link with .php check above – deerox Oct 12 '12 at 04:37

I want my Javascript to expire in 30 days

3 Answers3