Zend_Date，ISO_8601，日期解析和本地系统时钟

Question

I have a strange problem with Zend_Date object.

It seems that setters perform different operations with different system clock dates. Let's assume that system date is 28 January 2013, following code:

$now=new Zend_Date(Zend_Date::ISO_8601);
$now->now();
echo '<br/>now: ' . $now->toString();
echo '<br/>now->day: ' . $now->get(Zend_Date::DAY);
echo '<br/>now->month: ' . $now->get(Zend_Date::MONTH);
echo '<br/>now->year: ' . $now->get(Zend_Date::YEAR);
$end=new Zend_Date('2013-02-25 14:23:34', Zend_Date::ISO_8601);
echo '<br/>end: ' . $end->toString();
$end->setHour('23')->setMinute('59')->setSecond('59')->setDay($now->get(Zend_Date::DAY))->setMonth($now->get(Zend_Date::MONTH))->setYear($now->get(Zend_Date::YEAR));
echo '<br/>endAfterSetters: ' . $end->toString();

will produce following output:

now: 28-01-2013 14:04:28
now->day: 28
now->month: 01
now->year: 2013
end: 25-02-2013 14:23:34
endAfterSetters: 28-01-2013 23:59:59

But if you change system clock to 29 January 2013, output is different from expectations:

now: 29-01-2013 14:07:22
now->day: 29
now->month: 01
now->year: 2013
end: 25-02-2013 14:23:34
endAfterSetters: 01-01-2013 23:59:59

Last output is 01-01 -2013 23:59:59, but should be 29-01 -2013 23:59:59 !

It happens on PHP 5.3.2 and 5.3.16, Zend_Framework 10.7, latest Zend_Date 24880 version.

Everyting worked fine in the past.

Any ideas why it happens?

PS: I have also found jquery datatime plugin malfunciton while using it at 29,30,31 January... But i will describe it in other question.

Answer 1

Remember that your setters are called in sequence. So when you call setDay(29) you're telling it to change the date to 29th February 2013 , which isn't a valid date, so it's rolling that over to make it 1st March 2013 . Then you call setMonth(1) , which changes the month to January, giving you 1st January 2013 .

You can control this behaviour by passing the extend_month option to the Zend_Date constructor, see: http://framework.zend.com/manual/1.12/en/zend.date.overview.html#zend.date.options.extendmonth