How to convert timestamp milliseconds to time and date format in PHP

In PHP development, converting timestamps into readable date and time formats is one of the basic tasks. Such transformations are useful, for example, in the context of requirements analysis in logging, data logging, and other applications. In this article, we will explore how to convert timestamp milliseconds to time and date format in PHP.

1. Timestamp

In the computer field, "timestamp" refers to the number of seconds from a specific point in time (usually January 1, 1970) to the current time. Timestamps are a standard method for conveying time information between different platforms and programming languages. In PHP, the time() function returns the timestamp of the current time.

2. Timestamp milliseconds

Similar to timestamp, timestamp milliseconds are the number of milliseconds that have elapsed from a specific time point to the current time. Due to differences in computer systems, the returned timestamp millisecond value may vary. In PHP, you can use the microtime() function to get the number of milliseconds in the current time.

3. Convert timestamp milliseconds to time format

Use PHP’s built-in date() function to convert timestamp milliseconds into an easy-to-read time and date format. The following is a sample code:

<?php
// 获取当前时间戳毫秒
$timestamp_ms = round(microtime(true) * 1000);

// 转换为时间格式
$date = date("Y-m-d H:i:s", floor($timestamp_ms / 1000));

echo $date;
?>

The first line of code obtains the current timestamp milliseconds through the microtime() function and saves it in the $timestamp_ms variable. The second line of code converts the timestamp milliseconds to seconds and rounds them using the floor() function. Finally, pass the converted seconds as a parameter to the date() function to convert it into a readable time and date format.

If you need a more specific time and date format, you can modify the format string of the date() function. For example, to get a time format that only contains hours and minutes, you can use the following code:

$date = date("H:i", floor($timestamp_ms / 1000));

4. Notes

When using the date() function to convert timestamp milliseconds to date and time When formatting, you need to pay attention to the following:

1. Time stamp milliseconds must be converted to seconds before being used as input to the date() function.
2. The timestamp millisecond value may contain a decimal part and needs to be rounded using the round() function.
3. Performance issues may occur when converting with a large number of timestamp milliseconds. In this case, you may consider other more efficient methods, such as using the DateTime class.

5. Summary

In PHP development, converting timestamp milliseconds into readable date and time format is a basic task. This task can be easily accomplished using the built-in date() function, and the time and date format can be modified as needed. However, when you need to process a large number of timestamp milliseconds, be aware of performance issues and consider other alternatives.

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