How to get the current date and day of the week in php

In PHP, you can use the date() function to get the current date and day of the week. Just omit the second parameter of the date() function and set the first parameter to "Y-m-d H:i:s" to get the current date, the syntax is "date("Y-m-d H:i:s")"; and When the first parameter is set to "N", the day of the week can be obtained with the syntax "date("N")". "N" returns the day of the week as a number in ISO-8601 format, ranging from 1 (for Monday) to 7 (for Sunday).

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

In PHP, you can use date() Function to get the current date and day of the week.

The date() function can obtain the current timestamp and format the timestamp into a more readable date and time. The setting of month, day, and day of the week can also be extracted.

Let’s take a look at the date() function. Its syntax format is:

date(format,timestamp);

• format Required. Specifies the format of the timestamp.

• #timestamp Optional. Specify timestamp. The default is the current date and time.

Description: The format parameter is used to specify the formatting character and set the converted date format. Mainly uses the format parameter to format the timestamp and obtain the current date and day of the week.

Example 1: Use the date() function to get the current date

<?php 
header("content-type:text/html;charset=utf-8"); 
date_default_timezone_set("PRC");//设置时区
echo "当前时间为："; 
$today = date("Y-m-d H:i:s"); 
echo $today; 
?>

Use the date() function to set various A format for outputting dates, for example:

<?php 
header("content-type:text/html;charset=utf-8"); 
date_default_timezone_set("PRC");//设置时区
echo date("Y/m/d H:i:s") . "<br>"; 
echo date("y/m/d H:i:s") . "<br><br>"; 
echo date("Y-m-d H:i:s") . "<br>"; 
echo date("y-m-d H:i:s") . "<br><br>"; 
echo date("Y.m.d H:i:s") . "<br>"; 
echo date("y.m.d H:i:s") . "<br><br>"; 
?>

Example 2: Use the date() function to get the current day of the week

<?php 
header("content-type:text/html;charset=utf-8"); 
date_default_timezone_set("PRC");//设置时区
echo "今天是星期 ".date("N");
?>

Look at the calendar, right?

Explanation: date() can format the time and use the formatting character "N" to obtain the Sunday number

• N: Return The day of the week represented by numbers in ISO-8601 format (newly added in PHP 5.1.0), ranging from 1 (indicating Monday) to 7 (indicating Sunday)

Extended knowledge: formatting characters that can be set by parameter format

------Day of the month, 2 digits with leading zero The day of the week, text indicates , 3 letters ##j1##l( Lowercase "L") to N (meaning Monday) to S, ## together with j06z0365 ---ISO-8601 format Week in year, weekly Starting from Monday (new in PHP 4.1.0) (the 42nd week of the year)---##Fmonth, complete Text format, such as January or MarchDecember Numerical month, with leading zeros Three-letter abbreviation for the month Number of months, without leading zeros 28---LIf it is a leap year, it is1Y except if ISO If the week number (W1999For example: 1999 or For example: 99 or ##TimeLowercase AM and PM values ​​ or pm##APMSwatch Internet Standard Time Hour, 24 hour format, with leading zeros Number of minutes with leading zeros Number of seconds with leading zeros milliseconds (new in PHP 5.2.2). It should be noted that the date() ​​​​parameters, and DateTime::format() only supports milliseconds.

The format string can recognize the string of the following format parameters

format characters	Description	Example of return value
##日
d		01 To 31
D		Mon to Sun
month Days in , without leading zeros		to 31
Day of the week, complete text format	Sunday	Saturday
#Day of the week represented by numbers in ISO-8601 format (newly added in PHP 5.1.0)	1	7 (meaning Sunday)
The English suffix after the number of days in a month, 2 characters	st	nd, rd or th. You can use w
. The number represents the day of the week.	(meaning Sunday) to	(meaning Saturday)
in the year The days from	to	##week
---		W
For example: 42		Month
---
January to		##m
01 to 12		M
Jan to Dec		n
1 to 12		##tThe number of days in a given month
to 31		年---
		Whether it is a leap year
, otherwise it is0		oISO-8601 format year number. This is the same value as
) of   belongs to the previous year or the next year, use that year. (New in PHP 5.1.0) Examples:	or 2003	##Y A complete year represented by 4 digits
2003		y2-digit year
03		------
##a		am
		Capitalized AM and PM values ​​AM or
##B		000 to 999
##g	hour, 12 hour format, no leading zeros	1 to 12
G	Hour, 24 hour format, no leading zeros	0 to 23
h	hour, 12 hour format, with leading zeros	01 to 12
##H		00 to 23
i		00 to 59>
s		00 to 59>
u		function always returns 000000 because it only accepts integer
示例: 654321
时区	---	---
e	时区标识（PHP 5.1.0 新加）	例如：UTC，GMT，Atlantic/Azores
I	是否为夏令时	如果是夏令时为 1，否则为 0
O	与格林威治时间相差的小时数	例如：+0200
P	与格林威治时间（GMT）的差别，小时和分钟之间有冒号分隔（PHP 5.1.3 新加）	例如：+02:00
T	本机所在的时区	例如：EST，MDT（【译者注】在 Windows       下为完整文本格式，例如"Eastern Standard Time"，中文版会显示"中国标准时间"）。
Z	时差偏移量的秒数。UTC 西边的时区偏移量总是负的，UTC 东边的时区偏移量总是正的。	-43200 到 43200
完整的日期／时间	---	---
c	ISO 8601 格式的日期（PHP 5 新加）	2004-02-12T15:19:21+00:00
r	RFC 822 格式的日期	例如：Thu, 21 Dec 2000 16:01:07 +0200
U	从 Unix 纪元（January 1 1970 00:00:00 GMT）开始至今的秒数	参见 time()

注：format的大小写的区分非常重要

<?php
var_dump(date(&#39;Y-m-d H:i:s&#39;, 1616496304)); //H 24小时制 2021-03-23 18:45:04
var_dump(date(&#39;Y-m-d h:i:s&#39;, 1616496304)); //h 12小时制 2021-03-23 06:45:04
?>

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