- script will start on exact time (ex: 2015:06:15:00:00)
 - If its on time, it will alert HELLO every 1 second.
 
setInterval(function () {alert("Hello")}, 1000);
could you please help me how to make this on up?
setInterval(function () {alert("Hello")}, 1000);
could you please help me how to make this on up?
                        
                            
                        
                        
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                There is no possibility to define a date driven trigger in javascript.
Instead you might register your function from the beginning and check there if the start date is reached.
<html>
    <head>
        <script type="text/javascript">
            var startDate = new Date("2015-06-14 12:47");
            window.setInterval(checkDate, 1000);
            function checkDate()
            {
                if (new Date() > startDate)
                    myDate.value = new Date().toLocaleString(); //or do your alert ;)
            }
        </script>
    </head>
    <body>
        <input type="text" id="myDate" style="width: 200px" />
    </body>
</html>
                        
I believe I have the time set right in this JSFiddle