The PHP date () function is detailed

Date

(PHP 4, PHP 5)

date-format a local time/date description?

String date (string $format [, int $timestamp ])

Returns a string that is the result of an integer in a timestamp given format string. If no timestamp is given, the local current time is used. In other words, timestamp it is optional and the default value is time ().

Tip

Since PHP 5.1.1 There are several useful constants that can be used as standard date/time formats to specify format parameters.

Tip

The timestamp at the time $_SERVER[‘REQUEST_TIME‘] the request was initiated has been saved from PHP 5.1.

Note:

A valid timestamp typically ranges from 20:45:54 GMT December 13, 1901 to January 19, 2038 03:14:07. (This range conforms to the minimum and maximum values of a 32-bit signed integer). However, prior to PHP 5.1, this range was limited to some systems (such as Windows) from January 1, 1970 to January 19, 2038.

Note:

To convert the time that a string is expressed to a timestamp, you should use Strtotime (). In addition some databases have some functions to convert their time format into timestamps (such as MySQL's?). Unix_timestamp function).

format A string of format strings that can recognize the following parameters

formatCharacter
Description
Example of return value

Day
---
---

D
The day ordinal of a month with a leading zero 2-digit number
to

D
Day of the week, text representation, 3 letters
Mon to Sun

J
The day ordinal of the month without leading zeros
1 to

l(lowercase letter of "L")
Day of the week, full text format
Sunday to Saturday

N
ISO-8601 format number represents the day of the week (PHP 5.1.0 new Plus)
1(for Monday) to 7(= Sunday)

S
English suffix, 2 characters, after the number of days per month
St,nd,Rd or th. Can be used with J .

W
Day of the week, numbers indicate
0(for Sunday) to 6(= Saturday)

Z
The day ordinal of the year
0 to 365

Week
---
---

W
Week of the ISO-8601 format year, starting from Monday (PHP 4.1.0 New)
For example: (42nd week of the year)

Month
---
---

F
month, full text format, such as January or March
January to December

M
A number represents the month, with a leading zero
to

M
Three letter abbreviation for month
Jan to Dec

N
The number represents the month, without leading zeros
1 to

T
The number of days that a given month should be
from

Years
---
---

L
Whether it is a leap year
If the leap year is 1, otherwise 0

O
ISO-8601 format year number. This is the same value as Y , except if the day of the week (W) of the ISO belongs to the previous year or the next year. (PHP 5.1.0 new addition)
Examples: 1999 or 2003

Y
4-digit year in full representation
Example:1999 or 2003

Y
Year 2-digit representation
For example :

Time
---
---

A
Lowercase morning and afternoon values
am or pm

A
Uppercase morning and afternoon values
AM or PM

B
Swatch Internet Standard Time
to 999

G
Hours, 12-hour format, no leading zeros
1 to

G
Hours, 24-hour format, no leading zeros
0 to

H
Hours, 12-hour format, with leading zeros
to

H
Hours, 24-hour format, with leading zeros
From xx to

I
Number of minutes with leading zeros
From xx to >

S
Number of seconds with leading zeros
From xx to >

U
Milliseconds (PHP 5.2.2 new Plus). It is important to note that the date () function always returns 000000 because it accepts only the integer parameter, and Datetime::format () supports milliseconds.
Example: 654321

Time
---
---

E
Time zone ID (PHP 5.1.0 new addition)
For example:UTC,GMT,atlantic/azores

I
Whether it is daylight saving time
If daylight saving time is 1, otherwise 0

O
Hours of difference from GMT
Example:+0200

P
Difference from GMT (GMT), between hours and minutes colon separated (PHP 5.1.3 New)
Example:+02:00

T
The time zone in which this machine resides
For example:EST,MDT(the "translator note" is in full text format under Windows, such as "Eastern Standard Time", Chinese version will show "China normal times").

Z
The number of seconds of the slack offset. The time zone offset in the west of UTC is always negative, and the time zone offset to the east of UTC is always positive.
-43200 to 43200

Full Date/Time
---
---

C
Date in ISO 8601 format (PHP 5 new)
2004-02-12t15:19:21+00:00

R
Date in RFC 822 format
For example:Thu, Dec 16:01:07 +0200

U
The number of seconds since the Unix era (January 1 1970 00:00:00 GMT) started
See Time ()

http://www.php.net/manual/zh/function.date.php