Conversion
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<?php
/*
$format and $timestamp
correspond with that of date() and gmdate().
$timeoffset
is the time zone offset in seconds (-5:00 GMT would be -18000).
$dstoffset
is the Daylight Saving Time/Summer Time (when observed) offset in seconds (one hour would be 3600).
$dst
is an indicator of whether Daylight Saving Time/Summer Time is being observed.
*/
function realdate($format, $timestamp, $timeoffset, $dstoffset, $dst = FALSE)
{
$timestamp = $timestamp + $timeoffset + ((int)$dst * $dstoffset);
return gmdate($format, $timestamp);
}
?>
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Usage Example
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<?php
if(isset($_REQUEST['submit']))
{
$iOff = (int)$_REQUEST['offset'];
$iDST = (int)$_REQUEST['dstoffset'];
$bDST = (bool)$_REQUEST['dst'];
$strTime = '<p>The time is: ' . realdate('g:iA', time(), $iOff, $iDST, $bDST) . '</p>';
}
// *************************************************************************** \
/*
$format and $timestamp
correspond with that of date() and gmdate().
$timeoffset
is the time zone offset in seconds (-5:00 GMT would be -18000).
$dstoffset
is the Daylight Saving Time/Summer Time (when observed) offset in seconds (one hour would be 3600).
$dst
is an indicator of whether Daylight Saving Time/Summer Time is being observed.
*/
function realdate($format, $timestamp, $timeoffset, $dstoffset, $dst = FALSE)
{
$timestamp = $timestamp + $timeoffset + ((int)$dst * $dstoffset);
return gmdate($format, $timestamp);
}
// *************************************************************************** \
// List of the time zones and their corresponding offsets.
$aTimeOffsets =
array(
-43200 => '[GMT -12:00] International Date Line West',
-39600 => '[GMT -11:00] Midway Islands, Samoa',
-36000 => '[GMT -10:00] Hawaii-Aleutian Time',
-32400 => '[GMT -09:00] Alaska Time',
-28800 => '[GMT -08:00] Pacific Time (US & Canada)',
-25200 => '[GMT -07:00] Mountain Time (US & Canada)',
-21600 => '[GMT -06:00] Central Time (US & Canada)',
-18000 => '[GMT -05:00] Eastern Time (US & Canada)',
-14400 => '[GMT -04:00] Atlantic Time (Canada)',
-12600 => '[GMT -03:30] Newfoundland Time',
-10800 => '[GMT -03:00] Brasilia, Buenos Aires, Greenland',
-7200 => '[GMT -02:00] Mid-Atlantic Time',
-3600 => '[GMT -01:00] Azores, Cape Verde Island',
0 => '[GMT +00:00] Western Europe Time',
3600 => '[GMT +01:00] Central Europe Time',
7200 => '[GMT +02:00] Eastern Europe Time',
10800 => '[GMT +03:00] Eastern Africa Time',
12600 => '[GMT +03:30] Middle East Time',
14400 => '[GMT +04:00] Near East Time',
16200 => '[GMT +04:30] Kabul Time',
18000 => '[GMT +05:00] Pakistan-Lahore Time',
19800 => '[GMT +05:30] India Time',
20700 => '[GMT +05:45] Kathmandu Time',
21600 => '[GMT +06:00] Bangladesh Time',
25200 => '[GMT +07:00] Christmas Island Time',
28800 => '[GMT +08:00] China-Taiwan Time',
32400 => '[GMT +09:00] Japan Time',
34200 => '[GMT +09:30] Australia Central Time',
36000 => '[GMT +10:00] Australia Eastern Time',
39600 => '[GMT +11:00] Soloman Time',
43200 => '[GMT +12:00] New Zealand Time'
);
?>
<?php echo($strTime); ?>
<form action="<?php echo($_SERVER['PHP_SELF']); ?>" method="post">
Time Zone:<br />
<select name="offset">
<?php
foreach($aTimeOffsets as $iOffset => $strOffset)
{
$strSelected = ($iOffset == $iOff) ? ' selected="selected"' : '';
echo("tt<option value="{$iOffset}"{$strSelected}>{$strOffset}</option>n");
}
?>
</select><br />
<p>DST Offset in seconds:<br /><input type="text" name="dstoffset" value="<?php echo($iDST); ?>" /></p>
<p><input type="checkbox" name="dst"<?php if($bDST)echo(' checked="checked"'); ?> /> DST being observed?</p>
<input type="submit" name="submit" value="Show Me The Time" />
</form>
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