blocks|key|226574|text|尝尝这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226575|$date="2012-09-12";

if+(preg_match("/%5E[0-9]{4}-(0[1-9]%7C1[0-2])-(0[1-9]%7C[1-2][0-9]%7C3[0-1])$/",$date))+{
++++return+true;
}+else+{
++++return+false;
}|code-block|syntax|javascript|226576|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this.

<pre><code>$date="2012-09-12";

if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/",$date)) {
 return true;
} else {
 return false;
}
</code></pre>

blocks|key|226609|text|你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226610|if+(preg_match("/\d{4}\-\d{2}-\d{2}/",+$date))+{
++++echo+'true';
}+else+{
++++echo+'false';
}|code-block|syntax|javascript|226611|但是你最好使用这个：|226612|$date+=+DateTime::createFromFormat('Y-m-d',+$date);
if+($date)+{
++++echo+$date+->+format('Y-m-d');
}|226613|在这种情况下，你将得到一个比字符串更容易使用的对象。|226614|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can make it this way:

<pre><code>if (preg_match("/\d{4}\-\d{2}-\d{2}/", $date)) {
 echo 'true';
} else {
 echo 'false';
}
</code></pre>

but you'd better use this one:

<pre><code>$date = DateTime::createFromFormat('Y-m-d', $date);
if ($date) {
 echo $date -&gt; format('Y-m-d');
}
</code></pre>

in this case you'll get an object which is muck easier to use than just strings.

blocks|key|226820|text|我知道这是一个老问题。但我想我有一个很好的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226821|$date+=+"2016-02-21";
$format+=+"Y-m-d";

if(date($format,+strtotime($date))+==+date($date))+{
++++echo+"true";
}+else+{
++++echo+"false";
}|code-block|syntax|javascript|226822|你可以试试。如果将日期更改为21.02.2016，则回应为false。如果在此之后将格式更改为d.m.Y，则回声为真。|226823|有了这段简单的代码，您应该能够检查使用了哪种日期格式，而无需由正则表达式进行检查。|226824|也许有一个人会在每一个案例上测试它。但我认为我的想法总体上是有效的。对我来说，这似乎是合乎逻辑的。|226825|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I know that this is a old question. But I think I have a good solution.

<pre><code>$date = "2016-02-21";
$format = "Y-m-d";

if(date($format, strtotime($date)) == date($date)) {
 echo "true";
} else {
 echo "false";
}
</code></pre>

You can try it. If you change the date to 21.02.2016 the echo is false. And if you change the format after that to d.m.Y the echo is true.

With this easy code you should be able to check which date-format is used without checking it by the regex.

Maybe there is a person who will test it on every case. But I think my idea is generally valid. For me it seems logical.

blocks|key|444750|text|您可以使用带有checkdate+php函数的preg_match|type|unstyled|depth|inlineStyleRanges|entityRanges|data|444751|$date++=+"2012-10-05";
$split+=+array();
if+(preg_match+("/%5E([0-9]{4})-([0-9]{2})-([0-9]{2})$/",+$date,+$split))
{
++++return+checkdate($split[2],+$split[3],+$split[1]);
}

return+false;|code-block|syntax|javascript|444752|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use a preg_match with a checkdate php function

<pre><code>$date = "2012-10-05";
$split = array();
if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $split))
{
 return checkdate($split[2], $split[3], $split[1]);
}

return false;
</code></pre>

blocks|key|444804|text|preg_match需要一个/或另一个字符作为分隔符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|444805|preg_match("/%5E[0-9]{4}-[0-1][0-9]-[0-3][0-9]$/",$date)|code-block|syntax|javascript|444806|您还应该检查该日期的有效性，这样您就不会得到类似9999-19-38这样的结果|444807|bool+checkdate+(+int+$month+,+int+$day+,+int+$year+)|444808|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

preg_match needs a / or another char as delimiter.

<pre><code>preg_match("/^[0-9]{4}-[0-1][0-9]-[0-3][0-9]$/",$date)
</code></pre>

you also should check for validity of that date so you wouldn't end up with something like 9999-19-38

<pre><code>bool checkdate ( int $month , int $day , int $year )
</code></pre>

blocks|key|445231|text|用于验证通用日期格式的函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|445232|function+validateDate($date,+$format+=+'Y-m-d')+{
++$d+=+DateTime::createFromFormat($format,+$date);
++return+$d+&&+$d->format($format)+==+$date;
}|code-block|syntax|javascript|445233|执行示例：|445234|var_dump(validateDate('2021-02-28'));+//+true
var_dump(validateDate('2021-02-29'));+//+false|445235|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Function to validate generic date format:

<pre><code>function validateDate($date, $format = 'Y-m-d') {
 $d = DateTime::createFromFormat($format, $date);
 return $d &amp;&amp; $d-&gt;format($format) == $date;
}
</code></pre>

Example of execution:

<pre><code>var_dump(validateDate('2021-02-28')); // true
var_dump(validateDate('2021-02-29')); // false
</code></pre>

blocks|key|445244|text|可能对某些人有用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|445245|$patterns+=+array(
++++++++++++'Y'+++++++++++=>'/%5E[0-9]{4}$/',
++++++++++++'Y-m'+++++++++=>'/%5E[0-9]{4}(-%7C\/)([1-9]%7C0[1-9]%7C1[0-2])$/',
++++++++++++'Y-m-d'+++++++=>'/%5E[0-9]{4}(-%7C\/)([1-9]%7C0[1-9]%7C1[0-2])(-%7C\/)([1-9]%7C0[1-9]%7C[1-2][0-9]%7C3[0-1])$/',
++++++++++++'Y-m-d+H'+++++=>'/%5E[0-9]{4}(-%7C\/)([1-9]%7C0[1-9]%7C1[0-2])(-%7C\/)([1-9]%7C0[1-9]%7C[1-2][0-9]%7C3[0-1])\s(0%7C[0-1][0-9]%7C2[0-4])$/',
++++++++++++'Y-m-d+H:i'+++=>'/%5E[0-9]{4}(-%7C\/)([1-9]%7C0[1-9]%7C1[0-2])(-%7C\/)([1-9]%7C0[1-9]%7C[1-2][0-9]%7C3[0-1])\s(0%7C[0-1][0-9]%7C2[0-4]):?(0%7C[0-5][0-9]%7C60)$/',
++++++++++++'Y-m-d+H:i:s'+=>'/%5E[0-9]{4}(-%7C\/)([1-9]%7C0[1-9]%7C1[0-2])(-%7C\/)([1-9]%7C0[1-9]%7C[1-2][0-9]%7C3[0-1])\s(0%7C[0-1][0-9]%7C2[0-4]):?((0%7C[0-5][0-9]):?(0%7C[0-5][0-9])%7C6000%7C60:00)$/',
++++++++);
echo+preg_match($patterns['Y'],+'1996');+//+true
echo+preg_match($patterns['Y'],+'19966');+//+false
echo+preg_match($patterns['Y'],+'199z');+//+false
echo+preg_match($patterns['Y-m'],+'1996-0');+//+false
echo+preg_match($patterns['Y-m'],+'1996-09');+//+true
echo+preg_match($patterns['Y-m'],+'1996-1');+//+true
echo+preg_match($patterns['Y-m'],+'1996/1');+//+true
echo+preg_match($patterns['Y-m'],+'1996/12');+//+true
echo+preg_match($patterns['Y-m'],+'1996/13');+//+false
echo+preg_match($patterns['Y-m-d'],+'1996-11-1');+//+true
echo+preg_match($patterns['Y-m-d'],+'1996-11-0');+//+false
echo+preg_match($patterns['Y-m-d'],+'1996-11-32');+//+false
echo+preg_match($patterns['Y-m-d+H'],+'1996-11-31+0');+//+true
echo+preg_match($patterns['Y-m-d+H'],+'1996-11-31+00');+//+true
echo+preg_match($patterns['Y-m-d+H'],+'1996-11-31+24');+//+true
echo+preg_match($patterns['Y-m-d+H'],+'1996-11-31+25');+//+false
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+2400');+//+true
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+24:00');+//+true
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+24:59');+//+true
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+24:60');+//+true
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+24:61');+//+false
echo+preg_match($patterns['Y-m-d+H:i'],+'1996-11-31+24:61');+//+false
echo+preg_match($patterns['Y-m-d+H:i:s'],+'1996-11-31+24:6000');+//+true
echo+preg_match($patterns['Y-m-d+H:i:s'],+'1996-11-31+24:60:00');+//+true
echo+preg_match($patterns['Y-m-d+H:i:s'],+'1996-11-31+24:59:59');+//+true
echo+preg_match($patterns['Y-m-d+H:i:s'],+'1996-11-31+24:59:60');+//+false
echo+preg_match($patterns['Y-m-d+H:i:s'],+'1996-11-31+24:60:01');+//+false|code-block|syntax|javascript|445246|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Probably useful to someone:

<pre><code>$patterns = array(
 'Y' =&gt;'/^[0-9]{4}$/',
 'Y-m' =&gt;'/^[0-9]{4}(-|\/)([1-9]|0[1-9]|1[0-2])$/',
 'Y-m-d' =&gt;'/^[0-9]{4}(-|\/)([1-9]|0[1-9]|1[0-2])(-|\/)([1-9]|0[1-9]|[1-2][0-9]|3[0-1])$/',
 'Y-m-d H' =&gt;'/^[0-9]{4}(-|\/)([1-9]|0[1-9]|1[0-2])(-|\/)([1-9]|0[1-9]|[1-2][0-9]|3[0-1])\s(0|[0-1][0-9]|2[0-4])$/',
 'Y-m-d H:i' =&gt;'/^[0-9]{4}(-|\/)([1-9]|0[1-9]|1[0-2])(-|\/)([1-9]|0[1-9]|[1-2][0-9]|3[0-1])\s(0|[0-1][0-9]|2[0-4]):?(0|[0-5][0-9]|60)$/',
 'Y-m-d H:i:s' =&gt;'/^[0-9]{4}(-|\/)([1-9]|0[1-9]|1[0-2])(-|\/)([1-9]|0[1-9]|[1-2][0-9]|3[0-1])\s(0|[0-1][0-9]|2[0-4]):?((0|[0-5][0-9]):?(0|[0-5][0-9])|6000|60:00)$/',
 );
echo preg_match($patterns['Y'], '1996'); // true
echo preg_match($patterns['Y'], '19966'); // false
echo preg_match($patterns['Y'], '199z'); // false
echo preg_match($patterns['Y-m'], '1996-0'); // false
echo preg_match($patterns['Y-m'], '1996-09'); // true
echo preg_match($patterns['Y-m'], '1996-1'); // true
echo preg_match($patterns['Y-m'], '1996/1'); // true
echo preg_match($patterns['Y-m'], '1996/12'); // true
echo preg_match($patterns['Y-m'], '1996/13'); // false
echo preg_match($patterns['Y-m-d'], '1996-11-1'); // true
echo preg_match($patterns['Y-m-d'], '1996-11-0'); // false
echo preg_match($patterns['Y-m-d'], '1996-11-32'); // false
echo preg_match($patterns['Y-m-d H'], '1996-11-31 0'); // true
echo preg_match($patterns['Y-m-d H'], '1996-11-31 00'); // true
echo preg_match($patterns['Y-m-d H'], '1996-11-31 24'); // true
echo preg_match($patterns['Y-m-d H'], '1996-11-31 25'); // false
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 2400'); // true
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 24:00'); // true
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 24:59'); // true
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 24:60'); // true
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 24:61'); // false
echo preg_match($patterns['Y-m-d H:i'], '1996-11-31 24:61'); // false
echo preg_match($patterns['Y-m-d H:i:s'], '1996-11-31 24:6000'); // true
echo preg_match($patterns['Y-m-d H:i:s'], '1996-11-31 24:60:00'); // true
echo preg_match($patterns['Y-m-d H:i:s'], '1996-11-31 24:59:59'); // true
echo preg_match($patterns['Y-m-d H:i:s'], '1996-11-31 24:59:60'); // false
echo preg_match($patterns['Y-m-d H:i:s'], '1996-11-31 24:60:01'); // false
</code></pre>

blocks|key|226932|text|你也可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226933|if+(DateTime::createFromFormat('Y-m-d',+$date)->format('Y-m-d')+===+$date)+{

++++//+date+is+correctly+formatted+and+valid,+execute+some+code

}|code-block|syntax|javascript|226934|这不仅会检查格式，还会检查日期本身的有效性，因为DateTime将只创建有效的日期，这需要与输入匹配。|offset|length|style|CODE|226935|entityMap^0|0|0|O|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You could also do it like this:

<pre><code>if (DateTime::createFromFormat('Y-m-d', $date)-&gt;format('Y-m-d') === $date) {

 // date is correctly formatted and valid, execute some code

}
</code></pre>

This will not only check the format, but also the validity of the date self, since <code>DateTime</code> will create only valid dates and this needs to match the input.

blocks|key|226945|text|您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226946|function+validateDate($date,+$format+=+'Y-m-d+H:i:s')
{
++++$d+=+DateTime::createFromFormat($format,+$date);
++++return+$d+&&+$d->format($format)+==+$date;
}

$date="2012-09-12";++++
echo+validateDate($date,+'Y-m-d');+//+true+or+false|code-block|syntax|javascript|226947|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can use 

<pre><code>function validateDate($date, $format = 'Y-m-d H:i:s')
{
 $d = DateTime::createFromFormat($format, $date);
 return $d &amp;&amp; $d-&gt;format($format) == $date;
}

$date="2012-09-12"; 
echo validateDate($date, 'Y-m-d'); // true or false
</code></pre>

blocks|key|444838|text|如果要匹配该日期类型，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|444839|preg_match("~%5E\d{4}-\d{2}-\d{2}$~",+$date)|code-block|syntax|javascript|444840|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to match that type of date, use:

<pre><code>preg_match("~^\d{4}-\d{2}-\d{2}$~", $date)
</code></pre>

blocks|key|444872|text|这应该会告诉您格式是否有效以及输入的日期是否有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|444873|++++$datein+=+'2012-11-0';

++++if(preg_match('/%5E[0-9]{4}-(0[1-9]%7C1[0-2])-(0[1-9]%7C[1-2][0-9]%7C3[0-1])$/',+$datein)){
++++++++echo+'good';
++++}else{
++++++++echo+'no+good';
++++}|code-block|syntax|javascript|444874|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This should tell you if the format is valid and if the input date is valid.

<pre><code> $datein = '2012-11-0';

 if(preg_match('/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/', $datein)){
 echo 'good';
 }else{
 echo 'no good';
 }
</code></pre>

blocks|key|445010|text|在一行语句中检查和验证YYYY-MM-DD日期|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|445011|function+isValidDate($date)+{
++++return+preg_match("/%5E(\d{4})-(\d{1,2})-(\d{1,2})$/",+$date,+$m)
++++++++?+checkdate(intval($m[2]),+intval($m[3]),+intval($m[1]))
++++++++:+false;
}|code-block|syntax|javascript|445012|输出将为：|445013|var_dump(isValidDate("2018-01-01"));+//+bool(true)
var_dump(isValidDate("2018-1-1"));+++//+bool(true)
var_dump(isValidDate("2018-02-28"));+//+bool(true)
var_dump(isValidDate("2018-02-30"));+//+bool(false)|445014|允许不带前导零的日和月。如果您不希望这样做，那么regexp应该是：|445015|"/%5E(\d{4})-(\d{2})-(\d{2})$/"|445016|entityMap^0|B|A|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|T|$]]

Check and validate <code>YYYY-MM-DD</code> date in one line statement

<pre><code>function isValidDate($date) {
 return preg_match("/^(\d{4})-(\d{1,2})-(\d{1,2})$/", $date, $m)
 ? checkdate(intval($m[2]), intval($m[3]), intval($m[1]))
 : false;
}
</code></pre>

The output will be:

<pre><code>var_dump(isValidDate("2018-01-01")); // bool(true)
var_dump(isValidDate("2018-1-1")); // bool(true)
var_dump(isValidDate("2018-02-28")); // bool(true)
var_dump(isValidDate("2018-02-30")); // bool(false)
</code></pre>

Day and month without leading zero are allowed. If you don't want to allow this, the regexp should be:

<pre><code>"/^(\d{4})-(\d{2})-(\d{2})$/"
</code></pre>

blocks|key|444900|text|这完全取决于您希望这个函数有多严格。例如，如果您不想允许12个月以上的月份和31个以上的天数(不取决于月份，这将需要编写日期逻辑)，那么它可能会变得非常复杂：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|444901|function+checkDate($date)
{
++$regex+=+'/%5E'+.+
++++'('+.

++++//+Allows+years+0000-9999
++++'(?:[0-9]{4})'+.
++++'\-'+.

++++//+Allows+01-12
++++'(?:'+.
++++'(?:01)%7C(?:02)%7C(?:03)%7C(?:04)%7C(?:05)%7C(?:06)%7C(?:07)%7C(?:08)%7C(?:09)%7C(?:10)%7C'+.
++++'(?:11)%7C(?:12)'+.
++++')'+.
++++'\-'+.

++++//+Allows+01-31
++++'(?:'+.
++++'(?:01)%7C(?:02)%7C(?:03)%7C(?:04)%7C(?:05)%7C(?:06)%7C(?:07)%7C(?:08)%7C(?:09)%7C(?:10)%7C'+.
++++'(?:11)%7C(?:12)%7C(?:13)%7C(?:14)%7C(?:15)%7C(?:16)%7C(?:17)%7C(?:18)%7C(?:19)%7C(?:20)%7C'+.
++++'(?:21)%7C(?:22)%7C(?:23)%7C(?:24)%7C(?:25)%7C(?:26)%7C(?:27)%7C(?:28)%7C(?:29)%7C(?:30)%7C'+.
++++'(?:31)'+.
++++')'+.

++++'$/';

++if+(+preg_match($regex,+$date)+)+{
++++return+true;
++}

++return+false;
}

$result+=+checkDate('2012-09-12');|code-block|syntax|javascript|444902|就我个人而言，我只会选择：/%5E([0-9]{4}\-([0-9]{2}\-[0-9]{2})$/|offset|length|style|CODE|444903|entityMap^0|0|0|D|Z|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It all depends on how strict you want this function to be. For instance, if you don't want to allow months above 12 and days above 31 (not depending on the month, that would require writing date-logic), it could become pretty complicated:

<pre><code>function checkDate($date)
{
 $regex = '/^' . 
 '(' .

 // Allows years 0000-9999
 '(?:[0-9]{4})' .
 '\-' .

 // Allows 01-12
 '(?:' .
 '(?:01)|(?:02)|(?:03)|(?:04)|(?:05)|(?:06)|(?:07)|(?:08)|(?:09)|(?:10)|' .
 '(?:11)|(?:12)' .
 ')' .
 '\-' .

 // Allows 01-31
 '(?:' .
 '(?:01)|(?:02)|(?:03)|(?:04)|(?:05)|(?:06)|(?:07)|(?:08)|(?:09)|(?:10)|' .
 '(?:11)|(?:12)|(?:13)|(?:14)|(?:15)|(?:16)|(?:17)|(?:18)|(?:19)|(?:20)|' .
 '(?:21)|(?:22)|(?:23)|(?:24)|(?:25)|(?:26)|(?:27)|(?:28)|(?:29)|(?:30)|' .
 '(?:31)' .
 ')' .

 '$/';

 if ( preg_match($regex, $date) ) {
 return true;
 }

 return false;
}

$result = checkDate('2012-09-12');
</code></pre>

Personally I'd just go for: <code>/^([0-9]{4}\-([0-9]{2}\-[0-9]{2})$/</code>

blocks|key|226792|text|要使用PHP中的日期，您应该遵循php标准，因此给定的regex将确保您拥有可以与php一起操作的有效日期。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226793|++++preg_match("/%5E([0-9]{4})-(0[1-9]%7C1[0-2])-(0[1-9]%7C[1-2][0-9]%7C3[0-1])$/",$date)|code-block|syntax|javascript|226794|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To work with dates in php you should follow the php standard so the given regex will assure that you have valid date that can operate with PHP.

<pre><code> preg_match("/^([0-9]{4})-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/",$date)
</code></pre>

blocks|key|226989|text|如果有任何帮助，这里有一个j-n-Y格式的正则表达式(年份必须大于2018)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|226990|if+(preg_match('/%5E([1-9]%7C[1-2][0-9]%7C[3][0-1])\-([1-9]%7C[1][0-2])\-(?:20)([1][8-9]%7C[2-9][0-9])$/',+$date))+{
+++//+Do+stuff
}|code-block|syntax|javascript|226991|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If it is of any help, here is a regex for j-n-Y format (year has to be greater than 2018):

<pre><code>if (preg_match('/^([1-9]|[1-2][0-9]|[3][0-1])\-([1-9]|[1][0-2])\-(?:20)([1][8-9]|[2-9][0-9])$/', $date)) {
 // Do stuff
}
</code></pre>

blocks|key|227063|text|来自Laravel+5.7和日期格式，即:+12/31/2019|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227064|function+checkDateFormat(string+$date):+bool
{
++++return+preg_match("/%5E(0[1-9]%7C1[0-2])\/(0[1-9]%7C[1-2][0-9]%7C3[0-1])\/[0-9]{4}$/",+$date);
}|code-block|syntax|javascript|227065|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

From Laravel 5.7 and date format i.e.: 12/31/2019

<pre><code>function checkDateFormat(string $date): bool
{
 return preg_match("/^(0[1-9]|1[0-2])\/(0[1-9]|[1-2][0-9]|3[0-1])\/[0-9]{4}$/", $date);
}
</code></pre>

blocks|key|227094|text|我正在搜索“如何验证日期”，并找到了这个解决方案，它是旧的，但我将在下面分享可用于在php中验证日期的方法，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227095|checkdate('01',+'31',+'2019')|code-block|syntax|javascript|227096|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I was searching "how to validate date" and found this solution, Its old but i ll share below method that can be use to validate date in php,

<pre><code>checkdate('01', '31', '2019')
</code></pre>

blocks|key|227169|text|下面确保数字YYYY(1900-2099)-MM(01-12)-DD(01-31)，并使用checkdate()函数确保日期的正确性，例如2月29日：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227170|$date_pattern+=+'/%5E(19%7C20)\d{2}\-(0[1-9]%7C1[0-2])\-(0[1-9]%7C[12][0-9]%7C3[01])$/';

if+(empty($date)+%7C%7C+(!preg_match("$date_pattern",+$date,+$m)+%7C%7C+(!checkdate($m[2],+$m[3],+$m[1]))))+{
++++$echo+'Invalid+Start+date+e.g.+YYYY-MM-DD';
}|code-block|syntax|javascript|227171|要更改日期模式和年份范围：|227172|//模式DD/+MM+/YYYY，其中DD+(01-31)、MM+(01-12)和YYYY+(1950-2099)+&必须是数字-将检查日期()替换为!checkdate($m[2],+$m[1],+$m[3]|offset|length|style|CODE|227173|//扩展年份范围，例如1900-2099+/%5E(01-9%7C12%7C301)/(01-9%7C10-2)/(19%7C20)\d{2}$/+-用!checkdate($m[2],+$m[1],+$m[3]替换checkdate+()|227174|entityMap^0|0|0|0|23|U|0|1U|U|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@$K|Z|L|10|M|N]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

The below ensures digits YYYY(1900-2099)-MM(01-12)-DD(01-31) as well as utilises checkdate() function for date correctness e.g. 29 Feb:
<pre><code>$date_pattern = '/^(19|20)\d{2}\-(0[1-9]|1[0-2])\-(0[1-9]|[12][0-9]|3[01])$/';

if (empty($date) || (!preg_match(&quot;$date_pattern&quot;, $date, $m) || (!checkdate($m[2], $m[3], $m[1])))) {
 $echo 'Invalid Start date e.g. YYYY-MM-DD';
}
</code></pre>
To change date patterns and year range:
// pattern DD/MM/YYYY where DD (01-31), MM (01-12) and YYYY (1950-2099) &amp; have to be digits - replace checkdate () with <code>!checkdate($m[2], $m[1], $m[3]</code>
// To extend year range e.g. 1900-2099 /^(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[0-2])/(19|20)\d{2}$/ - replace checkdate () with <code>!checkdate($m[2], $m[1], $m[3]</code>

blocks|key|444980|text|此方法可用于在PHP中验证日期。当前方法用于mm/dd/yyyy格式。您必须根据您在explode中的格式和分隔符更新checkdate中的参数序列。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|444981|++++function+isValidDate($dt)
++++{
++++++++$dtArr+=+explode('/',+$dt);
++++++++if+(!empty($dtArr[0])+&&+!empty($dtArr[1])+&&+!empty($dtArr[2]))+{
++++++++++++return+checkdate((int)+$dtArr[0],+(int)+$dtArr[1],+(int)+$dtArr[2]);
++++++++}+else+{
++++++++++++return+false;
++++++++}
++++}|code-block|syntax|javascript|444982|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.explode.php|1|http://php.net/manual/en/function.checkdate.php^0|16|7|0|1N|9|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

This method can be useful to validate date in PHP. Current method is for mm/dd/yyyy format. You have to update parameter sequence in <a href="http://php.net/manual/en/function.checkdate.php" rel="nofollow noreferrer">checkdate</a> as per your format and delimiter in <a href="http://php.net/manual/en/function.explode.php" rel="nofollow noreferrer">explode</a> .

<pre><code> function isValidDate($dt)
 {
 $dtArr = explode('/', $dt);
 if (!empty($dtArr[0]) &amp;&amp; !empty($dtArr[1]) &amp;&amp; !empty($dtArr[2])) {
 return checkdate((int) $dtArr[0], (int) $dtArr[1], (int) $dtArr[2]);
 } else {
 return false;
 }
 }
</code></pre>

blocks|key|445145|text|如果您使用Symfony+4.1.2，请尝试以下命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|445146|++$validDate+=+explode("-",$request->get('date'));
++++++++if+(checkdate(filter_var($validDate[1],FILTER_SANITIZE_NUMBER_INT),filter_var($validDate[0],FILTER_SANITIZE_NUMBER_INT),filter_var($validDate[2],FILTER_SANITIZE_NUMBER_INT))){
++++++++++++$date+=+date_create(filter_var($request->get('date'),FILTER_SANITIZE_SPECIAL_CHARS));
++++++++}else{
++++++++++++return+$this->redirectToRoute('YOUR_ROUTE');
++++++++}|code-block|syntax|javascript|445147|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

[If you use Symfony 4.1.2 try this][1]

<pre><code> $validDate = explode("-",$request-&gt;get('date'));
 if (checkdate(filter_var($validDate[1],FILTER_SANITIZE_NUMBER_INT),filter_var($validDate[0],FILTER_SANITIZE_NUMBER_INT),filter_var($validDate[2],FILTER_SANITIZE_NUMBER_INT))){
 $date = date_create(filter_var($request-&gt;get('date'),FILTER_SANITIZE_SPECIAL_CHARS));
 }else{
 return $this-&gt;redirectToRoute('YOUR_ROUTE');
 }
</code></pre>

blocks|key|227141|text|一个更实用的模式可能是这样的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227142|$date="2012-09-12";

if+(preg_match("/%5E(20[0-9]{2})-(0[1-9]%7C1[0-2])-(0[1-9]%7C[1-2][0-9]%7C3[0-1])$/",$date))+{
++++return+true;
}+else+{
++++return+false;
}|code-block|syntax|javascript|227143|这将防止放置9999-09-12这样的值。|227144|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

A more pragmatic pattern could be like this
<pre><code>$date=&quot;2012-09-12&quot;;

if (preg_match(&quot;/^(20[0-9]{2})-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/&quot;,$date)) {
 return true;
} else {
 return false;
}
</code></pre>
Which will prevent to put 9999-09-12 such values.

I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup.

So I'm assuming I have made a mess of the regex, detailed below.

<pre><code>$date="2012-09-12";

if (preg_match("^[0-9]{4}-[0-1][0-9]-[0-3][0-9]$",$date))
 {
 return true;
 }else{
 return false;
 }
</code></pre>

Any thoughts?

PHP Regex to check date is in YYYY-MM-DD format

我正在尝试检查最终用户输入的日期是否采用YYYY-MM-DD格式。正则表达式从来都不是我的强项，我设置的preg_match()总是得到一个假返回值。因此，我假设我把正则表达式弄得一团糟，详细说明如下。$date="2012-09-12";if (preg_match("^[0-9]{4}-[0-1][0-9]-[0-3][0-9]$",$date))    {        return tru

问检查日期的PHP正则表达式采用YYYY-MM-DD格式
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回答 21

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