Help fixing Timezone and Timestamp conflict.

[Ramamoorthy]

Hello,

I am trying to convert the  Date,Month,Year, Hour:Minutes:Seconds  to Timestamp  and Timestamp  to Date,Month,Year, Hour:Minutes:Seconds .

 

I ve setted the Timezone as Asia/Calcutta in the code .

 

The Code works well when I run in my localhost , But when I run the code in my server located in Dallas,TX,USA the data changes largely .

For example :

The Timestamp generated for 24-May-2014 00:00:00 is 1400889600 in my localhost (Chennai, India).

The Timestamp generated for 24-May-2014 00:00:00 is 1400914800 in my server (Dallas, TX, USA).

 

why this changes occurs even though I ve setted the timezone ?

 

Code:

<?php
$date = new DateTime(null, new DateTimeZone('Asia/Calcutta'));
$ist = ($date->getTimestamp() + $date->getOffset());
echo "<h1>Current Timestamp and Date and Time for India</h1> <b>".$ist.'</b>';echo "     ";echo '<b>'.date('D, d M Y H:i:s ',$ist).'+0530</b>';
echo "<br />";
?>
<h1>Timestamp to Date and Time Converter</h1>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="number" name="timestamp_to_dt_timestamp" id="timestamp_to_dt_timestamp" />
<input type="submit" id="submit" name="submit" value="Submit" />
</form>
<?php 
if (isset($_POST['timestamp_to_dt_timestamp'])) {
$timestamp_to_dt_timestamp = $_POST['timestamp_to_dt_timestamp'];
echo 'Date and Time for the Timestamp :'.$timestamp_to_dt_timestamp.' is : '.date('D, d M Y H:i:s ',$timestamp_to_dt_timestamp);
}
?>
<h1>Date and Time to TimeStamp Converter</h1>
<form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
Date (no preceeding zeros):  <input type="text" name="dt_to_timestamp__date" id="dt_to_timestamp__date" value="<?php echo date('j',$ist) ?>" /><br />
Month (number): <input type="text" name="dt_to_timestamp__month" id="dt_to_timestamp__month" value="<?php echo date('n',$ist) ?>" /><br />
Year : <input type="text" name="dt_to_timestamp__year" id="dt_to_timestamp__year" value="<?php echo date('Y',$ist) ?>" /><br />
Hours : <input type="text" name="dt_to_timestamp__hours" id="dt_to_timestamp__hours" value="00" /><br />
Minutes : <input type="text" name="dt_to_timestamp__mins" id="dt_to_timestamp__mins" value="00" /><br />
Seconds : <input type="text" name="dt_to_timestamp__sec" id="dt_to_timestamp__sec" value="00" /><br />
<input type="submit" id="submit" name="submit" value="Submit" />
<p>Leave the time field(s) if you don't know the exact time.</p>
</form>
<?php


if (isset($_POST['dt_to_timestamp__date'])) {
$dt_to_timestamp__date = $_POST['dt_to_timestamp__date'];
}
if (isset($_POST['dt_to_timestamp__month'])) {
$dt_to_timestamp__month = $_POST['dt_to_timestamp__month'];
}
if (isset($_POST['dt_to_timestamp__year'])) {
$dt_to_timestamp__year = $_POST['dt_to_timestamp__year'];
}
if (isset($_POST['dt_to_timestamp__hours'])) {
$dt_to_timestamp__hours = $_POST['dt_to_timestamp__hours'];
}
if (isset($_POST['dt_to_timestamp__mins'])) {
$dt_to_timestamp__mins = $_POST['dt_to_timestamp__mins'];
}
if (isset($_POST['dt_to_timestamp__sec'])) {
$dt_to_timestamp__sec = $_POST['dt_to_timestamp__sec'];
}


if (isset($_POST['dt_to_timestamp__date'])) {
if (isset($_POST['dt_to_timestamp__month'])) {
if (isset($_POST['dt_to_timestamp__year'])) {
if (isset($_POST['dt_to_timestamp__hours'])) {
if (isset($_POST['dt_to_timestamp__mins'])) {
if (isset($_POST['dt_to_timestamp__sec'])) {


echo date(mktime($dt_to_timestamp__hours, $dt_to_timestamp__mins, $dt_to_timestamp__sec, $dt_to_timestamp__month, $dt_to_timestamp__date, $dt_to_timestamp__year));
}
}
}
}
}
}
?>

What I am missing ?

 

-Thanks

 

timestamp.php