Send php date to javascript and increment it

Question

I want to get the server time using php, and pass it to a javascript variable. Once it is passed, it will increment.

Here is my code:

function initTime(date){
var today=new Date(date);
var h=today.getHours();
var m=today.getMinutes();
var s=today.getSeconds();
m = checkTime(m);
s = checkTime(s);
document.getElementById('time').innerHTML = h+":"+m+":"+s;
}
function checkTime(i) {
if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
return i;
}

Situation: The user browse welcome page, the server time is sent and received by javascript.

I want to increment it, to make it a clock script. I don't want to get the server time every second using php, because it will use more server resources.

How can I increment it using javascript?

Just echo your server time directly as a value for your JavaScript variable. — Spencer Wieczorek
– Spencer Wieczorek, Commented Apr 14, 2015 at 13:33
I got the server time correctly. My problem is, How Can i increment it? For example, i got, 21:33:01, I want to make it 21:33:02 after a minute. — Pinas De Radio
– Pinas De Radio, Commented Apr 14, 2015 at 13:43

adeneo · Accepted Answer · 2015-04-14 13:34:39Z

1

You can just output the PHP date somewhere, either in a global variable, or as a data attribute somewhere you can get it

<div id="time" data-now="<?php echo time() * 1000; ?>"></div>

and then

var elem  = document.getElementById('time');
var timer = setInterval(initTime, 1000);

function initTime() {
    var time = +(elem.getAttribute('data-now')),
    time = time + 1000; // add one second

    var today = new Date( time ),
        h = today.getHours(),
        m = today.getMinutes(),
        s = today.getSeconds();

        m = checkTime(m);
        s = checkTime(s);

    elem.innerHTML = h + ":" + m + ":" + s;
    elem.setAttribute('data-now', today.getTime());
}

function checkTime(i) {
    if (i < 10) {
        i = "0" + i
    }; // add zero in front of numbers < 10
    return i;
}

FIDDLE

answered Apr 14, 2015 at 13:34

adeneo

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Comments

baao · Accepted Answer · 2015-04-14 13:24:11Z

1

Two ways. First, using moment.js:

setInterval(function() {
    document.getElementById('time').innerHTML = moment().format('HH:mm:ss');
},1000);

or using your function:

function initTime(date){
var today=new Date(date);
var h=today.getHours();
var m=today.getMinutes();
var s=today.getSeconds();
m = checkTime(m);
s = checkTime(s);
document.getElementById('time').innerHTML = h+":"+m+":"+s;
}
function checkTime(i) {
if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
return i;
}

setInterval(initTime(date),1000);

answered Apr 14, 2015 at 13:24

baao

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3 Comments

Pinas De Radio Over a year ago

It still not changing.

baao Over a year ago

What does the console log?

Pinas De Radio Over a year ago

I got the server time correctly. My problem is, How Can i increment it? For example, i got, 21:33:01, I want to make it 21:33:02 after a minute

Community · Accepted Answer · 2017-05-23 11:58:28Z

1

I found another question that was basically after the same thing. The initialized the JS date using the milliseconds from php:

<script type="text/javascript">
    var d = new Date(<?php echo time() * 1000 ?>);
</script>

Here is a jQuery clock plugin that you can use that you can feed a starting time to(your server time). Putting it all together, it would go something like this:

<script type="text/javascript">
    var d = new Date(<?php echo time() * 1000 ?>);
    $("#clock").clock({"timestamp":d.getTime()});
</script>

edited May 23, 2017 at 11:58

CommunityBot

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answered Apr 14, 2015 at 13:30

Paul Zepernick

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1 Comment

Spencer Wieczorek Over a year ago

If you believe the questions are asking the same think flag it as a duplicate.

Dovre · Accepted Answer · 2015-04-27 12:46:54Z

1

You can put your php variable in an hidden input :

<input id="your_input" value="<?php echo $my_var; ?>">

and get it in javascript with :

my_var = document.getElementById('your_input').value;

edited Apr 27, 2015 at 12:46

answered Apr 14, 2015 at 13:24

Dovre

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