Why this piece of code showing strange value for some particular input?
<p>I am developing a typing application using PHP and MySQL and little bit of javascript. The PHP code is used to get the server time. I am using the following javascript function to display the start time and end time(by adding 5 min with the minute value of start time) in the browser.</p>

<pre><code>function display(){   
// get the server time using PHP and print the start time and end time  
var servDateArray='&lt;?php print date("Y/n/d/H/i/s", time())?&gt;'.split('/');  
starttime_year = servDateArray[0];  
starttime_month = servDateArray[1];  
starttime_day = servDateArray[2];  
starttime_hour = servDateArray[3];  
starttime_minutes = servDateArray[4];  
starttime_seconds = servDateArray[5];  

// print the Start time  
document.getElementById("starttime_echoed").innerHTML= starttime_hour+":"+starttime_minutes+":"+starttime_seconds;  
                                                                                                        document.typing.starttime.value=starttime_hour+":"+starttime_minutes+":"+starttime_seconds;  

// print the End time  
endtime_hour = parseInt(starttime_hour) + 0;  
endtime_min = parseInt(starttime_minutes) + 5;  
endtime_sec = parseInt(starttime_seconds) + 0;  

if (endtime_sec&gt;=60) { endtime_sec = -(60 - endtime_sec); endtime_min = parseInt(endtime_min)+1; }  
if (endtime_min&gt;=60) { endtime_min = -(60 - endtime_min); endtime_hour = parseInt(endtime_hour)+1; }  
if (endtime_hour&gt;=24) { endtime_hour = -(24 - endtime_hour); }  
if (endtime_sec&lt;=9) { endtime_sec="0"+endtime_sec; }  
if (endtime_min&lt;=9) { endtime_min="0"+endtime_min; }  
if (endtime_hour&lt;=9) { endtime_hour="0"+endtime_hour; }  
document.getElementById("endtime_echoed").innerHTML= endtime_hour+":"+endtime_min+":"+endtime_sec;  
document.typing.endtime.value=endtime_hour+":"+endtime_min+":"+endtime_sec;  
displayTimer();  
}
</code></pre>

<p>The above code works perfectly well for all input values of Hours, minutes and seconds excepts when hour, minute and second are set to either 8 or 9. However, I have tried to debug by inserting a line of code alert(parseInt(starttime_minutes)); after the line endtime_min = parseInt(starttime_minutes) + 5; and it returned 0 when I supplied 8 or 9 as value for minute. I am sure this function returns 0 for hours, minutes and seconds. To be very specific I am giving you am example: If the server time is say 08:09:37 then the end time becomes 00:05:37. I am getting perplexed. Please help.</p>
