问题描述：

So I have been trying to find a solution for this around 1 hour and I cant find the solution.

how do I update DATE with the update_post_meta() function?

I have ACF field which is jquery(date).

update_post_meta($post_id,\'last_date\',$arr[9]);

when $arr[9] is 22/09/2018like my Date format.

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功能建议

所以我一直试图找到一个解决方案大约1小时，我找不到解决方案。</ p >

如何使用update_post_meta（）函数更新DATE？

我有ACF字段，即jquery（日期）。

我已经尝试</ p>

  update_post_meta  （$ post_id，\'last_date\'，$ arr [9]）; 
</ code> </ pre> 
当 $ arr [9] </ code>  22时 / 09/2018 </ strong> 
我的日期格式。</ p> 
</ div> 
网友观点：
For update_post_meta function it doesn\'t matter which kind of value you have. It stores it as a string. So the problem can\'t be related to $arr[9]\'s datetime format.  
That\'s why there are only two options to check: 
Write 
echo $post_id; 
before update_post_meta() function and check if it displays correct ID.
Again, check your database wp_postmeta table and search for \\\"last_date\\\" field. May be it has some another prefix or postfix.
If to do these 2 steps, you will find the reason by 100%.
    
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try like this, I think your date format is not correct:
$date_stamp = strtotime($arr[9]);
$postdate = date(\\\"Y-m-d H:i:s\\\", $date_stamp);
update_post_meta($post_id,\'last_date\',$postdate);