奇怪的 strtotime 与格林威治标准时间一直完美运行到 3 月 31 日

Question

动态生成 select 格式，该格式适用于 3 月 31 日之前的日期，但对于 4 月 1 日及之后的日期是错误的。您可以看到我专门指定了 GMT，这至少对 date:March 31.

非常有效

    $today = strtotime("today GMT");
    <select name="date">
    <option value=<?php echo $d = strtotime('0 day',$today); ?>> <?php echo date('d M, Y', $d).'-'.$d; ?></option>
    <option value=<?php echo $d = strtotime('1 day',$today); ?>> <?php echo date('d M, Y', $d).'-'.$d; ?></option>
    <option value=<?php echo $d = strtotime('2 day',$today); ?>> <?php echo date('d M, Y', $d).'-'.$d; ?></option>
<-remainings->
</select>

生成代码

28 Mar, 2019-1553731200<--Correct March 28, 2019 12:00:00 AM
29 Mar, 2019-1553817600<--Correct
30 Mar, 2019-1553904000<--Correct
31 Mar, 2019-1553990400<--Correct
01 Apr, 2019-1554073200<--Wrong March 31, 2019 11:00:00 PM  (this and remainings should be April <nextday>, 2019 12:00:00 AM)
02 Apr, 2019-1554159600<--Wrong April 1, 2019 11:00:00 PM 
03 Apr, 2019-1554246000<--Wrong April 2, 2019 11:00:00 PM
04 Apr, 2019-1554332400<--Wrong April 3, 2019 11:00:00 PM
05 Apr, 2019-1554418800<--Wrong April 4, 2019 11:00:00 PM
06 Apr, 2019-1554505200<--Wrong April 5, 2019 11:00:00 PM

Answer 1

尝试将此 $today = strtotime("today GMT"); 更改为此
$today = strtotime("today",gmdate('U'));

当我在我的系统（2019 年 3 月 31 日 18:00 时区 EDT）上执行这个 $today = strtotime("today GMT"); 时，结果是 1553990400 30 Mar, 2019 20:00

我阅读了 PHP: Datetime Relative Formats Doc，但没有发现任何格式使用时区的迹象，这就是我尝试使用 gmdate('U').

的原因

此代码：

echo "\ngmdate\n";
echo "current date: ",strtotime("today"),"<-- ",date('d M, Y H:i'),"\n";
echo "'today GMT': ",strtotime("today GMT"),"<--",date('d M, Y H:i',strtotime("today GMT")),"\n\n";
$todayGMdate = strtotime("today",gmdate('U'));

echo $todayGMdate,"<-- ",date('d M, Y H:i',$todayGMdate),"\n";
for ($i = 0; $i < 10; $i++) {
    $d=strtotime("+$i day",$todayGMdate);
    echo date('d M, Y', $d).'-'.$d," <-- ",date('d M, Y H:i',$d),"\n";
}

产生这个结果：

gmdate
current date: 1554091200<-- 01 Apr, 2019 10:44
'today GMT': 1554076800<--31 Mar, 2019 20:00

1554091200<-- 01 Apr, 2019 00:00
01 Apr, 2019-1554091200 <-- 01 Apr, 2019 00:00
02 Apr, 2019-1554177600 <-- 02 Apr, 2019 00:00
03 Apr, 2019-1554264000 <-- 03 Apr, 2019 00:00
04 Apr, 2019-1554350400 <-- 04 Apr, 2019 00:00
05 Apr, 2019-1554436800 <-- 05 Apr, 2019 00:00
06 Apr, 2019-1554523200 <-- 06 Apr, 2019 00:00
07 Apr, 2019-1554609600 <-- 07 Apr, 2019 00:00
08 Apr, 2019-1554696000 <-- 08 Apr, 2019 00:00
09 Apr, 2019-1554782400 <-- 09 Apr, 2019 00:00
10 Apr, 2019-1554868800 <-- 10 Apr, 2019 00:00

似乎 strtotime("today GMT") 在当前语言环境中获取今天的开始，然后添加 gmt 偏移量。

我怀疑文档中的这条注释在起作用：

注：

Relative statements are always processed after non-relative statements. This makes "+1 week july 2008" and "july 2008 +1 week" equivalent.

Exceptions to this rule are: "yesterday", "midnight", "today", "noon" and "tomorrow". Note that "tomorrow 11:00" and "11:00 tomorrow" are different. Considering today's date of "July 23rd, 2008" the first one produces "2008-07-24 11:00" where as the second one produces "2008-07-24 00:00". The reason for this is that those five statements directly influence the current time.

奇怪的 strtotime 与格林威治标准时间一直完美运行到 3 月 31 日

weird strtotime with GMT which worked perfectly till march 31

php

strtotime

gmt