PHP date format a local time/date_PHP tutorial
date
(PHP 4, PHP 5)
date — Format a local time/date
Description
string date ( string $format [, int $timestamp ] )Returns a string generated by integer timestamp according to the given format string. If no timestamp is given, the local current time is used. In other words, timestamp is optional and the default value is time().
TipSince PHP 5.1.1 there are several useful constants for specifying the format parameter in standard date/time formats.
TipSince PHP 5.1, the timestamp of the time when the request was initiated is saved in $_SERVER['REQUEST_TIME'].
Note:
The typical range of valid timestamps is December 13, 1901 20:45:54 GMT to January 19, 2038 03:14:07 GMT. (This range conforms to the minimum and maximum values of 32-bit signed integers). However, prior to PHP 5.1 this range was limited to January 1, 1970 to January 19, 2038 on some systems such as Windows.
Note:
To convert the time represented by a string into a timestamp, strtotime() should be used. In addition, some databases have functions to convert their time format into timestamps (such as MySQL's » UNIX_TIMESTAMP function).
format character | Description | Return value example |
---|---|---|
日 | --- | --- |
d | The day of the month, a 2-digit number with leading zeros | 01 to 31 |
D | Day of the week, text representation, 3 letters | Mon to Sun |
j | The day of the month, without leading zeros | 1 to 31 |
l (lower case letter of “L”) | Day of the week, complete text format | Sunday to Saturday |
N | The day of the week represented by numbers in ISO-8601 format (newly added in PHP 5.1.0) | 1 (meaning Monday) to 7 (meaning Sunday) |
S | The English suffix after the day of the month, 2 characters | st, nd, rd or th. Can be used with j |
w | The day of the week, represented by numbers | 0 (meaning Sunday) to 6 (meaning Saturday) |
z | Day of the year | 0 to 366 |
Week | --- | --- |
W | The week number of the year in ISO-8601 format, each week starts on Monday (new in PHP 4.1.0) | Example: 42 (the 42nd week of the year) |
Month | --- | --- |
F | Month, complete text format, such as January or March | January to December |
m | The month represented by the number, with leading zeros | 01 to 12 |
M | Month represented by three-letter abbreviation | Jan to Dec |
n | Numeric month, without leading zeros | 1 to 12 |
t | The number of days in a given month | 28 to 31 |
Year | --- | --- |
L | Whether it is a leap year | If it is a leap year, it is 1, otherwise it is 0 |
o | ISO-8601 format year number. This is the same value as Y , except that if the ISO week number (W) belongs to the previous or next year, that year is used. (New in PHP 5.1.0) | Examples: 1999 or 2003 |
Y | Full 4-digit year | For example: 1999 or 2003 |
y | 2-digit year | For example: 99 or 03 |
Time | --- | --- |
a | Lowercase AM and PM values | am or pm |
A | Capital AM and PM values | AM or PM |
B | Swatch Internet Standard Time | 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 | Hour, 24-hour format, with leading zeros | 00 to 23 |
i | Minutes with leading zeros | 00 to 59> |
s | Seconds, with leading zeros | 00 to 59> |
Time Zone | --- | --- |
e | Time zone identifier (new in PHP 5.1.0) | Example: UTC, GMT, Atlantic/Azores |
I | Whether it is daylight saving time | 1 if it is daylight saving time, 0 otherwise |
O | Hours from Greenwich Mean Time | Example: +0200 |
P | The difference from Greenwich Mean Time (GMT), there is a colon separating hours and minutes (newly added in PHP 5.1.3) | Example: +02:00 |
T | The time zone where this machine is located | For example: EST, MDT ([Translator's Note] In complete text format under Windows, such as "Eastern Standard Time", the Chinese version will display "China Standard Time"). |
Z | Time difference offset in seconds. Time zone offsets west of UTC are always negative, and time zone offsets east of UTC are always positive. | -43200 to 43200 |
Full date/time | --- | --- |
c | Date in ISO 8601 format (new in PHP 5) | 2004-02-12T15:19:21+00:00 |
r | Date in RFC 822 format | Example: Thu, 21 Dec 2000 16:01:07 +0200 |
U | Number of seconds since the Unix epoch (January 1 1970 00:00:00 GMT) | See time() |
Unrecognized characters in the format string will be displayed unchanged. The Z format always returns 0 when using gmdate().

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