Password date() function for time in PHP

In the daily use of PHP, we inevitably need to use time. PHP has a built-in date() function to help us unlock the way of time. This article will take you through it. Take a look at the code of time.

First, let’s take a look at the syntax of the date() function

date ( string $format  , int $timestamp = ? )

$timestamp: optional. Specifies an integer Unix timestamp. The default is the current local time (time()).

$format: Output date string Format

Among them, the more commonly used:

• m -- --- with Month with leading 0 digits from 01 to 12

• Y -- --- Year with 4 digits Example: 1999 or 2003

• j ----- The day of the month, without leading 0 From 1 to 31

• ## c ----- ISO 8601 date and time (new in PHP 5 ) 2004-02-12T15:19:21 00:00

• W ---- The number of weeks in the year specified by ISO-8601, Monday is regarded as the beginning of the week. (Newly added in PHP 4.1.0) Example: 42 (42nd week of this year)

Get the current time

<?php
$today = date("F j, Y, g:i a"); //April 16, 2021, 2:55 am
echo $today."<br>";
$today = date("m.d.y");     //04.16.21             
echo $today."<br>";
$today = date("j, n, Y");//16, 4, 2021
echo $today."<br>";                       
$today = date("Ymd");//20210416
echo $today."<br>";                          
$today = date(&#39;h-i-s, j-m-y, it is w Day z &#39;);//02-55-37, 16-04-21, 5530 5537 5 Friam21 105
echo $today."<br>";  
$today = date(&#39;\i\t \i\s \t\h\e jS \d\a\y.&#39;); //it is the 16th day.
echo $today."<br>";  
$today = date("D M j G:i:s T Y");//Fri Apr 16 2:55:37 UTC 2021
echo $today."<br>";
$today = date(&#39;H:m:s \m \i\s\ \m\o\n\t\h&#39;); //02:04:37 m is month   
echo $today."<br>";
$today = date("H:i:s");//02:55:37
echo $today."<br>";                        
$today = date("Y-m-d H:i:s");//2021-04-16 02:55:37
echo $today."<br>";                   
?>

has a second parameter:

<?php
$datetime=time(); //获取时间戳
echo $datetime."<br>";
echo date("Y-m-d H:i:s",$datetime);//将时间戳转换为要求的日期时间格式
echo date("Y年m月d日 H点i分s秒",$datetime);
?>

输出：
03:05:33
2021-04-16 03:05:33
1618542333
2021-04-16 03:05:332021年04月16日 03点05分33秒

We can see that the second parameter is a timestamp. This number represents the time from Greenwich Mean Time (1970-01-01) to now.

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