Clock on webpage using server and system time?

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I need to add a clock to a web page. The clock needs to be synchronized with a server but I really don\'t want to have it constantly check the server as the page will be ope

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北恋

2021-01-02 03:56
+Date.now() returns local ms since the Unix epoch. So:
- Get time from server
- Calculate difference between server time and local time
- Update the clock every second or minute (depending on what you're displaying) by getting the local time and adjusting it using the difference
- Every 15 mins update the difference.
Or something like that.

Here's a fiddle demonstrating the first half:
```
var serverTime = 1310127993162; //this would come from the server obviously
var localTime = +Date.now();
var timeDiff = serverTime - localTime;

setInterval(function () {
    console.log(+Date.now() + timeDiff);
}, 1000); 
```
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不思量自难忘°

2021-01-02 04:01

Server Time: <input type="text" id="clock" value="" size='8'>

<script type="text/javascript">
var serverTime = <?php echo time() * 1000; ?>; //this would come from the server
var localTime = +Date.now();
var timeDiff = serverTime - localTime;

setInterval(function () {
    var realtime = +Date.now() + timeDiff;
    var date = new Date(realtime);
    // hours part from the timestamp
    var hours = date.getHours();
    // minutes part from the timestamp
    var minutes = date.getMinutes();
    // seconds part from the timestamp
    var seconds = date.getSeconds();

    // will display time in 10:30:23 format
    var formattedTime = hours + ':' + minutes + ':' + seconds;

    $('#clock').attr('value',formattedTime); <-- input id=clock
}, 1000);
</script>

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礼貌的吻别

2021-01-02 04:08
The way I've gone about this before is:
- Take the time from the server,
- Take the time from the client (immediately)
- Get an offset.
- When showing the clock, apply the offset to the current time on the client.
You only need to update this occasionally from the server.

The problem that you've got to sort out though is that in making a request to get the time from the server, there will be a lag before you can get the client time. You can probably minimize this by using an ajax request to get the server time and nothing else, thereby cutting overhead and network lag etc.
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悲哀的现实

2021-01-02 04:12

one idea is to response datetime on page when it is requested. like:

<html>
your serveside codes,
<script>
var serverdatetime = new Date("<%=Datetime.Now%>");
//use serverdatetime and update it after 15 mins.

// you can use ajax to get datetime
setTimeout(function(){
    $.ajax({
  url: 'http://yourhost.com/getdate',
  success: function( data ) {
    // use data and update serverdatetime
  }
});},54000);
</script>
server codes

</html>

**note : this is idea only, code may not work

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后悔当初

2021-01-02 04:13

Try below code this :

var m_serverDateTime;
var currentOffsetedTime;
var diffMilliseconds;

$(document).ready(function () {
   m_serverDateTime = getServerDateTime();/*your function to get server time 
by ajax call */   
diffMilliseconds = GetServerTimeDifference(m_serverDateTime);

});

 function GetServerTimeDifference(serverdatetime) {
  var fromdate = new Date();

  var todate = new Date(serverdatetime);

  var localdiffMilliseconds = todate - fromdate;

  return localdiffMilliseconds;
 }

setInterval(function () {
  //var currentOffsetedTime = new Date().setMinutes(diffMinutes);
  currentOffsetedTime = new Date();
  currentOffsetedTime.setMilliseconds(diffMilliseconds);

  $('#lblTimer').text(format(currentOffsetedTime, 'dd/MM/yyyy  HH:mm'));
}, 1000);

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無奈伤痛

2021-01-02 04:13

you just get one time date time from server, on load call this method and use moments js for format date:

var timeMiliSecond = new Date(serverTime).getTime();
 callRepeatedly() {
    setTimeout(() => {
         timeMiliSecond = timeMiliSecond+1000;         
         serverTime=moment(newDate(timeMiliSecond)).format('MM-DD-YYYY HH:mm:ss');
         this.callRepeatedly();
      }, 1000)  
  }

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