blocks|key|514709|text|因为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|514710|unix时间戳是一种将时间作为运行总秒来跟踪的方法。这一统计从1970年1月1日世界协调时的Unix时代开始。因此，unix时间戳只是特定日期与Unix之间的秒数。还应该指出(感谢本网站访问者的评论)，无论您位于全球何处，这一时间点在技术上都不会改变。这对于计算机系统在在线和客户端的动态和分布式应用程序中跟踪和排序日期信息非常有用。|514711|来源：http://www.unixtimestamp.com/index.php|offset|length|514712|entityMap|0|LINK|mutability|MUTABLE|url|http://www.unixtimestamp.com/index.php^0|0|0|3|12|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Because:

The unix time stamp is a way to track time as a running total of seconds. This count starts at the Unix Epoch on January 1st, 1970 at UTC. Therefore, the unix time stamp is merely the number of seconds between a particular date and the Unix Epoch. It should also be pointed out (thanks to the comments from visitors to this site) that this point in time technically does not change no matter where you are located on the globe. This is very useful to computer systems for tracking and sorting dated information in dynamic and distributed applications both online and client side.

Source: <a href="http://www.unixtimestamp.com/index.php" rel="nofollow">http://www.unixtimestamp.com/index.php</a>

blocks|key|115060|text|strtotime返回自划时代以来的秒数。然而，从文档中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|115061|此外，并不是所有的平台都支持负时间戳，因此您的日期范围可能限制在不早于Unix时代。这意味着，例如1970年1月1日前的日期将无法在Windows、一些Linux发行版和其他几个操作系统上工作。不过，PHP5.1.0和更新版本克服了这一限制|blockquote|115062|作为另一种选择，如果您知道格式，我建议从该格式创建一个日期：|115063|$var+=+'26/11/1949';
echo+$var;
$date+=+DateTime::createFromFormat('d/m/Y');
$var+=+$date->format('d/m/Y');
echo+$var;|code-block|syntax|javascript|115064|entityMap^0|0|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|V|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|W|8|@]|D|@]|E|$N|O]]|$1|P|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|Q|$]]

<code>strtotime</code> returns the number of seconds since the epoch. However from the docs:

<blockquote>
 Additionally, not all platforms support negative timestamps, therefore
 your date range may be limited to no earlier than the Unix epoch. This
 means that e.g. dates prior to Jan 1, 1970 will not work on Windows,
 some Linux distributions, and a few other operating systems. PHP 5.1.0
 and newer versions overcome this limitation though
</blockquote>

As an alternative if you know the format I would recommend creating a date from that format:

<pre><code>$var = '26/11/1949';
echo $var;
$date = DateTime::createFromFormat('d/m/Y');
$var = $date-&gt;format('d/m/Y');
echo $var;
</code></pre>

blocks|key|115104|text|问题是，26/11/1949不是strtotime()所识别的格式的日期。当日期的各个部分用/分隔时，它希望它是m/d/Y，但是26不是一个有效的月份号。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|115105|您应该使用Date::create_from_format，以便指定如何解析$var：|115106|$date+=+Date::create_from_format('d/m/Y',+$var);|code-block|syntax|javascript|115107|entityMap^0|4|A|G|B|1A|1|1K|5|1S|2|0|5|O|12|4|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|N|$]]

The problem is that <code>26/11/1949</code> is not a date in a format that <code>strtotime()</code> recognizes. When the parts of a date are separated by <code>/</code>, it expects it to be <code>m/d/Y</code>, but <code>26</code> is not a valid month number.

You should use <code>Date::create_from_format</code> so you can specify how <code>$var</code> should be parsed:

<pre><code>$date = Date::create_from_format('d/m/Y', $var);
</code></pre>

blocks|key|115198|text|请参阅日期格式|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|115199|如果PHP在字符串中看到一个/，它假设US格式日期为mm/dd/YYYY，而26个月的第11天无效|style|CODE|115200|英国格式日期需要-而不是/|115201|$var+=+date("d/m/Y",+strtotime(str_replace('/',+'-',$var)));|code-block|syntax|javascript|115202|但是最好还是使用DateTime对象|115203|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/datetime.formats.date.php^0|3|4|0|0|E|1|Q|A|0|8|1|C|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@$A|13|B|14|F|G]|$A|15|B|16|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|17|8|@$A|18|B|19|F|G]|$A|1A|B|1B|F|G]]|9|@]|C|$]]|$1|J|3|K|5|L|7|1C|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

See <a href="http://www.php.net/manual/en/datetime.formats.date.php" rel="nofollow">Date Formats</a>

if PHP sees a <code>/</code> in the string, it assumes US format dates <code>mm/dd/YYYY</code> and the 11th day of the 26th month isn't valid 

UK format dates need <code>-</code> rather than <code>/</code>

<pre><code>$var = date("d/m/Y", strtotime(str_replace('/', '-',$var)));
</code></pre>

But better to use DateTime objects anyway

blocks|key|1353011|text|返回日期为1/1/1970的原因是strtotime()失败并返回false，后者将转换为1/1/1970，这是第一个unix时代日期。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1353012|这些问题都围绕着这样一个事实:出于某种理由，美国人以月、日、年开始约会。当你说它的时候，听起来不错，但它使日期转换有点像噩梦，因为计算机和世界其他地方都使用更符合逻辑的y/m/d或d/m/y。所以，如果它在日期字符串中看到一个/，它就假设它是一种美国的日期格式。|1353013|因此，如果要使用|1353014|$var+=+'11/26/1949';
echo+$var+.+PHP_EOL;
$var+=+date("d/m/Y",+strtotime($var));
echo+$var;|code-block|syntax|javascript|1353015|但是幸运的是，如果您将分隔器转换为-而不是/，它也会工作。|1353016|$var+=+'26/11/1949';
echo+$var+.+PHP_EOL;
$var+=+str_replace('/',+'-',+$var);
echo+'Converted+date+'+.+$var+.+PHP_EOL;
$var+=+date("d/m/Y",+strtotime($var));
echo+$var;|1353017|entityMap^0|H|B|X|5|19|8|0|35|1|0|0|0|H|1|L|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|T|$]]

The reason you are getting a date returned of 1/1/1970 is that <code>strtotime()</code> is failing and returning <code>false</code> which converts to <code>1/1/1970</code> the first unix epoch date.

These sort of problems all revolve around the fact that the Americans for some obsquire reason start a date with the month and then the day and then the year. Sound ok when you speak it but it makes date convertion a bit of a nightmare because computers, and the rest of the world, use a more logical y/m/d or d/m/y. So PHP assumes it is a Amerian date format if it see's a <code>/</code> in the date string.

So the date convertion would work if you were to use

<pre><code>$var = '11/26/1949';
echo $var . PHP_EOL;
$var = date("d/m/Y", strtotime($var));
echo $var;
</code></pre>

But luckily it will also work if you convert the seperators to <code>-</code> instead of <code>/</code>

<pre><code>$var = '26/11/1949';
echo $var . PHP_EOL;
$var = str_replace('/', '-', $var);
echo 'Converted date ' . $var . PHP_EOL;
$var = date("d/m/Y", strtotime($var));
echo $var;
</code></pre>

blocks|key|115261|text|这里的问题是strtotime()无法识别您的日期。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|115262|strtotime()可以接受的日期格式列表在PHP文档中列出。不幸的是，使用dd/mm/y的格式与此处列出的任何格式不匹配。因此，如果继续使用代码，在大多数情况下都会出现数据转换错误。|115263|我的建议是手动解析日期，使用mktime从其中获取UNIX时间戳，然后使用date输出格式日期。如果脚本允许，可以选择使用不同的strtotime()友好日期格式。|115264|我还会推荐使用DateTime()类，特别是如果您计划对日期进行进一步的操作。您可以使用日期：：createFromFormat(‘d/m/Y’)函数从字符串中设置DateTime对象。|115265|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/datetime.formats.date.php|1|http://php.net/manual/en/function.mktime.php|2|http://php.net/manual/en/book.datetime.php|3|http://php.net/manual/en/datetime.createfromformat.php^0|6|B|0|0|B|13|7|N|5|0|0|1S|B|E|6|1|0|7|A|2|18|T|3|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|H|3|I|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|J|3|K|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]|$9|1K|A|1L|1|1M]]|E|$]]|$1|L|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]|T|$5|O|P|Q|E|$R|U]]|V|$5|O|P|Q|E|$R|W]]|X|$5|O|P|Q|E|$R|Y]]]]

The problem here is that strtotime() can not recognize your date.

List of date formats acceptable by strtotime() are listed in <a href="http://php.net/manual/en/datetime.formats.date.php" rel="nofollow">PHP documentation</a> . Unfortunately the format you use dd/mm/y doesn't match any format listed there. So if you keep using your code you'll have wrong data conversion in most cases.

My suggestion is to parse the date manually, use <a href="http://php.net/manual/en/function.mktime.php" rel="nofollow">mktime</a> to get UNIX timestamp from it and then use date to output format date. Optionally you can start using different strtotime() friendly date format if your scripts allow it.

I'd also recomend using <a href="http://php.net/manual/en/book.datetime.php" rel="nofollow">DateTime()</a> class especially if you plan to do further manipulation with your date. The you can use <a href="http://php.net/manual/en/datetime.createfromformat.php" rel="nofollow">DateTime::createFromFormat('d/m/Y')</a> function to het DateTime object from your string.

I have this code below and it outputs
26/11/1949 but when run through the <code>strtotime</code> it outputs the <code>ephoc</code> time of 1970

<pre><code>$var = '26/11/1949';
echo $var;
$var = date("d/m/Y", strtotime($var));
echo $var;
</code></pre>

More importantly how can I get the rearranged version of dates before and after ephoc?

Why does this break strtotime

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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下面有下面的代码，它输出了26/11/1949，但是当运行strtotime时，它输出了1970年的ephoc时间。$var = '26/11/1949';echo $var;$var = date("d/m/Y", strtotime($var));echo $var;更重要的是，我如何才能得到重新安排的日期之前和之...

问为什么这会破坏时间
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