使用DST获取当前的星期开始/结束日期 [英] Get current week start/end date with DST

问题描述

我几个月来一直在使用以下代码，没有任何问题，以便获取当前的星期开始/结束日期（星期一/星期日）：

I was using the following code for some months now without any issue in order to get the current week start/end date (Monday/Sunday):

date_default_timezone_set('Europe/Bucharest'); //this is the default in php.ini

$monday = strtotime('next Monday -1 week');
$monday = date('w', $monday)==date('w') ? $monday+7*86400 : $monday;
$sunday = strtotime(date("Y-m-d",$monday)." +6 days");
echo "Current week start/end date:<br>";
echo $this_week_sd = date("Y-m-d",$monday)."<br>";
echo $this_week_ed = date("Y-m-d",$sunday)."<br>";

//Expected result: 
2018-10-29
2018-11-04

但是，从今天起，由于某种原因，这一天已被1天抵消：

However, as of Today this for some reason has been offset by 1 day:

//Actual incorrect result:
2018-10-28
2018-11-03

然后我想起了昨天，由于夏令时，时钟又回到了1小时，所以我决定将时区从欧洲/布加勒斯特更改为欧洲/伊斯坦布尔，相对于格林尼治标准时间+3小时：

Then I remembered that Yesterday the clock went back 1 hour due to DST, so I decided to change the timezone from Europe/Bucharest to Europe/Istanbul which still has a +3 hours advance against GMT:

date_default_timezone_set('Europe/Istanbul');

//Now the result is correct: 
2018-10-29
2018-11-04

问题是，如何在当前代码中偏移DST，以便我可以将相对的星期日期保持在欧洲/布加勒斯特时区？任何指示或解释将不胜感激。谢谢。

Question is, how can I offset DST in the current code so that I could keep the relative week dates in accordance with Europe/Bucharest timezone? Any pointers or explanations would be appreciated. Thank you.

推荐答案

我知道有多种方法可以给猫换皮，但是在这种情况下，我很感兴趣

I am aware that there is more than one way to skin a cat, but in this case I was interested in how to fix my current code and more importantly to find out what's wrong with it.

谢谢大家的建议，尤其是@misorude指出了明显的缺陷在我的初始代码中，并非每天都有86400秒，在DST期间尤其如此。

Thank you all for your suggestions, especially to @misorude for pointing out the obvious flaw in my initial code, whereas "not every day has 86400 seconds", which is especially true during DST.

因此，这是使用相对的天而不是日期的更新的工作代码固定秒数：

So here's the updated working code using relative "days" instead of fixed seconds amount:

$monday = strtotime('next Monday -1 week');
$monday = date('w', $monday)==date('w') ? strtotime(date("Y-m-d",$monday)." +7 days") : $monday;
$sunday = strtotime(date("Y-m-d",$monday)." +6 days");
echo "This week start/end date:<br>";
echo $this_week_sd = date("Y-m-d",$monday)."<br>";
echo $this_week_ed = date("Y-m-d",$sunday)."<br>";

//output:
This week start/end date:
2018-10-29
2018-11-04

再次感谢大家的投入。非常感谢！

Once again, thank you all for your inputs. Much appreciated!

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