note 67084 deleted from function.mktime by derick
| From: | derick@php.net | Date: | Sun, 24 Sep 2006 11:49:34 +0000 |
| Subject: | note 67084 deleted from function.mktime by derick | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-117496@lists.php.net to get a copy of this message | ||
Note Submitter: dswigger at yahoo dot com
----
Thought I would share a bit. Hope someone finds it useful.
// The logic was ported from javascript : http://webexhibits.org/daylightsaving/b.html
// If any date is between these two then:
//During DST, clocks are turned forward an hour, effectively moving an hour of daylight from the
morning to the evening.
define('ZT_DST_US', 1);//United States dst
define('ZT_DST_EU', 2);//European Union dst
function ztcalhlp_getGMTDST(&$destStart,&$destEnd,$year,$dst_type=ZT_DST_EU)
{
// USA
if($dst_type == ZT_DST_US)
{
$dstTime=2;
$AprilDate=(2+6 * $year - floor($year / 4) ) % 7 + 1;
$OctoberDate=(31-(floor ($year * 5 / 4) + 1) % 7);
$MarchDate=14 - (floor (1 + $year * 5 / 4) % 7);
$NovemberDate=7 - (floor (1 + $year * 5 / 4) % 7);
$dstMonth1=($year>2006)?3:4;
$dstMonth2=($year>2006)?11:10;
$dstDay1 =($year>2006)?$MarchDate:$AprilDate;
$dstDay2 =($year>2006)?$NovemberDate:$OctoberDate;
$destStart=mktime($dstTime,0,0,$dstMonth1,$dstDay1,$year);
$destEnd=mktime($dstTime,0,0,$dstMonth2,$dstDay2,$year);
return;
}
// has to eu then..
$dstTime=1;
$MarchDateEU=(31-(floor ($year * 5 / 4) + 4) % 7);
$OctoberDateEU=(31-(floor ($year * 5 / 4) + 1) % 7);
$destStart=mktime($dstTime,0,0,3,$MarchDateEU,$year);
$destEnd=mktime($dstTime,0,0,10,$OctoberDateEU,$year);
}