note 47230 added to function.mktime
| From: | ErikOskam at osu1 dot php dot net | Date: | Sun, 07 Nov 2004 19:13:33 +0000 |
| Subject: | note 47230 added to function.mktime | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-80234@lists.php.net to get a copy of this message | ||
I found a bug in the code I posted yesterday. Date ("w") returns a zero for a sunday which
has to be a 7 when we start counting on monday with a 1. Since 2003 and 2004 have januari 4 on a
sunday it didn't appear to me that I corrected this in the $offset variable. For years that
don't have jan 4 on a sunday the function returned bogus. The corrected one:
<?PHP
function datefromweeknr($year, $week, $day)
{
$jan04 = mktime (0,0,0,01,4, $year); // jan 04 always in week 1
$firstday = date("w", $jan04); // fetch day of week of jan 04
if($firstday == 0) { $firstday = 7; }
$offset = ($week-1) * 7 - $firstday + $day; //calc number of days difference from jan 04
return strtotime('+' .$offset .' days', $jan04);
}
?>
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Manual Page -- http://www.php.net/manual/en/function.mktime.php
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