PHP verifies whether the format of a date is correct

In PHP development, we will definitely come into contact with the date() function. We have introduced some uses of the PHPdate function before. I believe everyone will use it. This article mainly teaches you how to determine whether the format of a date is correct in PHP.

Idea

You can use strtotime() to convert the date ($date) into a timestamp, and then use date() to convert it into the format that needs to be verified. A date is compared with $date to see if it is the same to verify whether the format of the date is correct.

Regular verification date format

$dateTime=”2010-6-4 00:00:00″;
if(preg_match(“/^d{4}-d{2}-d{2} d{2}:d{2}:d{2}$/s”,$dateTime))
{
echo “Yes”;
}else{
echo “No”;
}

Example

/* 
* 方法 isDate 
* 功能 判断日期格式是否正确 
* 参数 $str 日期字符串 
$format 日期格式 
* 返回 无 
*/ 
function is_Date($str,$format='Y-m-d'){ 
    $unixTime_1=strtotime($str); 
    if(!is_numeric($unixTime_1)) return false; //如果不是数字格式，则直接返回 
    $checkDate=date($format,$unixTime_1); 
    $unixTime_2=strtotime($checkDate); 
    if($unixTime_1==$unixTime_2){ 
        return true; 
    }else{ 
        return false; 
    } 
}

Note that the above judgment method is sufficient for general requirements , but it is not very strict. It will also return true for dates in this format such as 2012-03-00 or 2012-02-31. I have not found a better solution

The following code verifies whether the date is 2015 The format of -08-11 20:06:08:

<?php
 header("Content-type:text/html;charset=utf-8");
 $date = &#39;2015-08-11 20:06:08&#39;;
 if( date(&#39;Y-m-d H:i:s&#39;, strtotime($date))  == $date )
 {
  echo &#39;yes&#39;;
 }
 else
 {
  echo &#39;no&#39;;
 }
?>

So to verify whether the date format is 2015-08-11, you can change it to if(date('Y-m-d', strtotime($date) ) == $date ) to determine, verify other formats, and so on.

Although the article seems very short and the method seems simple, it is indeed a very practical small case. Everyone, hurry up and get it!

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php date() function obtains the current date and time and Detailed explanation of formatting method parameters

Do you know the difference between php date and gmdate to obtain the date?

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