Detailed explanation of date() function of PHP function_PHP tutorial

The date() function is a date function that we often encounter and use in PHP development. Now I will introduce to you some basic appearances and methods of the date() function. Friends who need to know more can refer to it. ​

Date and time functions are a core component of PHP. No installation is required to use these functions. Let’s talk about the specific usage of date function in detail:

PHP Date() function
The PHP Date() function formats a timestamp into a more readable date and time.

Grammar
date(format,timestamp)

format required. Specifies the format of the timestamp.
timestamp is optional. Specify timestamp. The default is the current date and time.

PHP date and time function date()

The code is as follows

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代码如下	复制代码
$t=time(); echo date("Y-m-d H:i:s",$t);

$t=time();

echo date("Y-m-d H:i:s",$t);

The format of the first parameter respectively represents:
a - "am" or "pm"
A - "AM" or "PM"
d - day, two digits, if there are less than two digits, add zero in front; for example: "01" to "31"
D - day of the week, three English letters; such as: "Fri"
F - month, full English name; such as: "January"
h - hour in 12-hour format; e.g.: "01" to "12"
H - hour in 24-hour format; e.g.: "00" to "23"
g - hour in 12-hour format, no zeros are added if there are less than two digits; such as: "1" to 12"
G - hour in 24-hour format, no zeros are added if there are less than two digits; such as: "0" to "23"
i - minutes; e.g.: "00" to "59"
j - Day, two digits, if there are less than two digits, do not add zeros; for example: "1" to "31"
l - day of the week, full English name; such as: "Friday"
m - month, two digits, if there are less than two digits, add zeros in front; such as: "01" to "12"
n - month, two digits, if there are less than two digits, no zero will be added; for example: "1" to "12"
M - month, three English letters; such as: "Jan"
s - seconds; e.g.: "00" to "59"
S - add an English ordinal number at the end of the word, two English letters; such as: "th", "nd"
t - the number of days in the specified month; such as: "28" to "31"
U - Total seconds
w - Numeric day of the week, such as: "0" (Sunday) to "6" (Saturday)
Y - year, four digits; such as: "1999"
y - year, two digits; such as: "99" z - day of the year; e.g.: "0" to "365"

For other characters not listed above, list the character directly

代码如下	复制代码
echo date('Y-m-j'); 2007-02-6   echo date('y-n-j'); 07-2-6

1. Year-month-day

The code is as follows	Copy code
echo date('Y-m-j' ); 2007-02-6 echo date('y-n-j'); 07-2-6

代码如下	复制代码
echo date('Y-M-j'); 2007-Feb-6   echo date('Y-m-d'); 2007-02-06

An uppercase Y represents a four-digit year, while a lowercase y represents a two-digit year; Lowercase m represents the number of the month (with a leading), while lowercase n represents the number of the month without the leading.

The code is as follows	Copy code
echo date('Y-M-j' ); 2007-Feb-6 echo date('Y-m-d'); 2007-02-06

Uppercase M represents the 3 abbreviated characters of the month, while lowercase m represents the number of the month (with leading 0);
There is no uppercase J, only lowercase j represents the day of the month, without the leading o; if a leading month is required, use a lowercase d.

The code is as follows

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echo date('Y-M-j' );

代码如下	复制代码
echo date('Y-M-j'); 2007-Feb-6   echo date('Y-F-jS'); 2007-February-6th

2007-Feb-6

echo date('Y-F-jS');
2007-February-6th

Capital M represents the 3 abbreviated characters of the month, while capital F represents the full English letter of the month. (no lowercase f) Capital S represents the suffix of the date, such as "st", "nd", "rd" and "th", depending on the date number.

Summary:

You can use uppercase Y or lowercase y to indicate the year;
Months can be represented by uppercase F, uppercase M, lowercase m and lowercase n (two ways to represent characters and numbers respectively);
Lowercase d and lowercase j can be used to represent the day, and uppercase S represents the suffix of the date.


2. Hour:minute:second

代码如下	复制代码
echo date('g:i:s a'); 5:56:57 am   echo date('h:i:s A'); 05:56:57 AM

By default, PHP interprets the displayed time as "Greenwich Mean Time", which is 8 hours different from our local time.

The code is as follows

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echo date('g:i: s a');
5:56:57 am

代码如下	复制代码
echo date('G:i:s'); 14:02:26

echo date('h:i:s A');

05:56:57 AM

A lowercase g indicates a 12-hour clock without leading 0s, while a lowercase h indicates a 12-hour clock with leading 0s.
When using the 12-hour clock, it is necessary to indicate morning and afternoon. Lowercase a represents lowercase "am" and "pm", and uppercase A represents uppercase "AM" and "PM".

The code is as follows	Copy code
echo date('G:i:s'); 14:02:26

Capital G represents the hour in 24-hour format, but without leading; use capital H to represent hour in 24-hour format with leading

Summary:

代码如下	复制代码
echo date('L'); 今年是否闰年：0   echo date('l'); 今天是：Tuesday   echo date('D'); 今天是：Tue

The letter g represents the hour without leading, and the letter h represents the hour with leading;
Lowercase g and h represent the 12-hour format, while uppercase G and H represent the 24-hour format.

3. Leap year, week, day

代码如下	复制代码
echo date('w');

The code is as follows	Copy code
echo date('L'); Whether this year is a leap year: 0 echo date('l'); Today is: Tuesday echo date('D'); Today is: Tue

Capital L indicates whether this year is a leap year, Boolean value, returns 1 if true, otherwise 0; The lowercase l represents the full English word for the day of the week (Tuesday); Instead, use a capital D to represent the 3-character abbreviation of the day of the week (Tue).

The code is as follows	Copy code
echo date('w');

Today’s week: 2

代码如下	复制代码
echo date('W');

This week is week 06 of the year

The lowercase w represents the day of the week, and the numeric form represents
Capital W represents the number of weeks in the year

The code is as follows

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代码如下	复制代码
echo date('t');

echo date('t');

This month is 28 days

The code is as follows

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代码如下	复制代码
echo date('z');

echo date('z');

Today is the 36th day of the year

Lowercase t represents the number of days in the current month
Lowercase z indicates what day of the year today is

4. Others

The code is as follows

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echo date('T');

代码如下	复制代码
echo date('T'); UTC

UTC

Capital T indicates the server’s time locale

The code is as follows

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代码如下	复制代码
echo date('I'); 0

echo date('I');

0

Capital I means to determine whether the current daylight saving time is, if true, return 1, otherwise 0

代码如下	复制代码
echo date('U'); 1170769424

The code is as follows	Copy code
echo date('U'); 1170769424

代码如下	复制代码
echo date('c'); 2007-02-06T14:24:43+00:00

Capital U represents the total number of seconds from January 1, 1970 to the present, which is the UNIX timestamp of the Unix time epoch.

The code is as follows

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echo date('c');

代码如下	复制代码
echo date('r'); Tue, 06 Feb 2007 14:25:52 +0000

2007-02-06T14:24:43+00:00

Lowercase c represents the ISO8601 date. The date format is YYYY-MM-DD. The letter T is used to separate the date and time. The time format is HH:MM:SS. The time zone is represented by the offset from Greenwich Mean Time (GMT). .

The code is as follows	Copy code
echo date('r'); Tue, 06 Feb 2007 14:25:52 +0000

Lowercase r indicates RFC822 date.

http://www.bkjia.com/PHPjc/445277.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445277.htmlTechArticleThe date() function is a date function that we often encounter and use in PHP development. Let me do it below Let me introduce some basic functions and methods of the date() function. Friends who need to know more...