How to convert 13-digit timestamp into specific time information in PHP

The timestamp in PHP refers to the total number of seconds from 00:00:00 UTC on January 1, 1970 on the UNIX system to the current time, usually expressed in the form of a 10-digit number. But sometimes, we will need more specific time information, such as a timestamp accurate to milliseconds. In this case, a 13-bit timestamp needs to be used.

So, how to convert the 13-digit timestamp into specific time information? Here are some commonly used methods.

Method 1: Use PHP’s built-in date() function

PHP’s built-in date() function can convert timestamps into date and time information in any format. Moreover, the date() function is also very complete in supporting 13-digit timestamps. We can easily convert 13-digit timestamps into specific time information. The specific operation steps are as follows:

$timestamp = 1589341234567; // 13位时间戳
$date = date("Y-m-d H:i:s", $timestamp/1000); // 将13位时间戳除以1000，并以指定的格式输出时间信息
echo $date; // 输出格式化后的时间信息

In the above code, we first define a 13-digit timestamp $timestamp, which represents the time information of 9:53:54 seconds and 567 milliseconds on May 13, 2020. Next, we use the date() function to divide $timestamp by 1000 and output the time information in the "Y-m-d H:i:s" format, that is, convert the 13-digit timestamp into a string of year, month, day, hour, minute and second. Finally, we use the echo statement to output the time information.

Method 2: Use PHP’s built-in DateTime class

In PHP 5.2 and above, we can use PHP’s built-in DateTime class to convert 13-digit timestamps. The DateTime class can output time information in a fixed format, and it supports complex operations such as time zones. The following is the code that uses the DateTime class to convert a 13-digit timestamp:

$timestamp = 1589341234567; // 13位时间戳
$date = new DateTime();
$date->setTimestamp($timestamp/1000); // 将13位时间戳除以1000，并将时间戳设置给DateTime对象
echo $date->format('Y-m-d H:i:s'); // 输出格式化后的时间信息

In the above code, we create a DateTime object and use the setTimestamp() method to divide the 13-digit timestamp by 1000 and set the timestamp Assigned to DateTime object. Then, we use the format() method to output the time information in the specified format.

Method 3: Use other third-party libraries

In addition to PHP's built-in functions and classes, we can also use some third-party libraries to convert 13-digit timestamps. For example, we can use the Carbon library, which is a lightweight and elegant date processing library in PHP. It can handle operations such as date, time, and date range. The following is the code for converting 13-digit timestamps using the Carbon library:

$timestamp = 1589341234567; // 13位时间戳
$date = \Carbon\Carbon::createFromTimestampMs($timestamp); // 使用createFromTimestampMs()方法将13位时间戳赋值给Carbon对象
echo $date->toDateTimeString(); // 输出格式化后的时间信息

In the above code, we use the createFromTimestampMs() method to assign the 13-digit timestamp to the Carbon object. Then, we use the toDateTimeString() method to output the time information in "Y-m-d H:i:s" format.

In short, in PHP, converting a 13-digit timestamp into specific time information is a very simple matter. You can choose a method that suits you according to your needs.

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