How to use the datetime class in php? Introduction to the usage of datetime in php

When we write a program, we may encounter the need to process time and date, such as year, month, day, hour, minute, second, region, etc.; what can we do at this time? The following article will introduce to you how to use the datetime class in PHP to process time and date.

By using the datetime class in How to use the datetime class in php? Introduction to the usage of datetime in php, we can easily get the relative time of the current date and time, as well as absolute dates and times such as "the last day of the specified month" Calculation, in addition, if you want a time format such as "x year x month x day" you can also use the datetime class. Let’s take a look at the specific content below.

Let’s take a look firstformat

Basically, the datetime class uses the date specified by each instance as the benchmark, and uses its own method to perform various operations on the benchmark date. various treatments.

In the sample code below, the datetime class is processed based on the current date and time.

//If nothing is specified in the constructor, an instance based on the current date and time will be generated

$now = new DateTime();
$now->format('Y-m-d H:i:s');        // 显示当前的时间格式 「2018-12-25 15:32:09」
$now->format('Y月m月d日 H时i分s秒');  // 显示当前时间格式为「2018年21月25日 13时32分09秒」

Let’s actually write it

Example The code shows the processing often done in the DateTime class.

Create the date and time specified by the constructor

// 创建字符串指定的日期和时间
$date = new DateTime('2018-01-01 00:00:00');

// 以format为指定形式的字符串
echo $date->format('Y-m-d H:i:s').PHP_EOL; // 2018-01-01 00:00:00

Use the method to update the reference date and time

// 使用的setDate方法来设置日期
$date->setDate(2000, 10, 10);   // 设置2000年10月10日

// 使用的setDate方法来设置时间
$date->setTime(12, 10, 20);     // 设置12时10分10秒

// 确认基准日期是否已改变
echo $date->format('Y-m-d H:i:s').PHP_EOL; // 2000-10-10 12:10:20

Get the date at the end of the month

// 生成指定的日期
$date = new DateTime('2018-01-01'));

// 用数值取得符合日期时间的月的最后一天
echo $date->format('t').PHP_EOL; // 31

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