You should be more careful to use NULL in various PHP versions:
<?php
// PHP <=7.4 it'll be 1970-01-01
echo date("Y-m-d", null)); //1970-01-01
// PHP >=8 it'll be current date
echo date("Y-m-d", null)); //2024-09-05
(PHP 4, PHP 5, PHP 7, PHP 8)
date — Format a Unix timestamp
Returns a string formatted according to the given format string using the
given integer timestamp (Unix timestamp) or the current time
if no timestamp is given. In other words, timestamp
is optional and defaults to the value of time().
Unix timestamps do not handle timezones. Use the DateTimeImmutable class, and its DateTimeInterface::format() formatting method to format date/time information with a timezone attached.
formatFormat accepted by DateTimeInterface::format().
Зауваження: date() will always generate
000000as microseconds since it takes an int parameter, whereas DateTimeInterface::format() does support microseconds if an object of type DateTimeInterface was created with microseconds.
timestamp
Необов'язковий параметр timestamp — це позначка часу Unix
типу int, яка стандартно дорівнює поточному місцевому часу, якщо
timestamp не вказаний або null. Тобто є результатом
функції time().
Returns a formatted date string.
Якщо часовий пояс хибний, то під час кожного виклику функції дати/часу
виникатиме E_WARNING. Див.
date_default_timezone_set().
| Версія | Опис |
|---|---|
| 8.0.0 |
timestamp is nullable now.
|
Приклад #1 date() examples
<?php
// set the default timezone to use.
date_default_timezone_set('UTC');
// Prints something like: Monday
echo date("l");
// Prints something like: Monday 8th of August 2005 03:12:46 PM
echo date('l jS \of F Y h:i:s A');
// Prints: July 1, 2000 is on a Saturday
echo "July 1, 2000 is on a " . date("l", mktime(0, 0, 0, 7, 1, 2000));
/* use the constants in the format parameter */
// prints something like: Wed, 25 Sep 2013 15:28:57 -0700
echo date(DATE_RFC2822);
// prints something like: 2000-07-01T00:00:00+00:00
echo date(DATE_ATOM, mktime(0, 0, 0, 7, 1, 2000));
?>You can prevent a recognized character in the format string from being expanded by escaping it with a preceding backslash. If the character with a backslash is already a special sequence, you may need to also escape the backslash.
Приклад #2 Escaping characters in date()
<?php
// prints something like: Wednesday the 15th
echo date('l \t\h\e jS');
?>It is possible to use date() and mktime() together to find dates in the future or the past.
Приклад #3 date() and mktime() example
<?php
$tomorrow = mktime(0, 0, 0, date("m") , date("d")+1, date("Y"));
$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"), date("Y"));
$nextyear = mktime(0, 0, 0, date("m"), date("d"), date("Y")+1);
?>Зауваження:
This can be more reliable than simply adding or subtracting the number of seconds in a day or month to a timestamp because of daylight saving time.
Some examples of date() formatting. Note that you should escape any other characters, as any which currently have a special meaning will produce undesirable results, and other characters may be assigned meaning in future PHP versions. When escaping, be sure to use single quotes to prevent characters like \n from becoming newlines.
Приклад #4 date() Formatting
<?php
// Assuming today is March 10th, 2001, 5:16:18 pm, and that we are in the
// Mountain Standard Time (MST) Time Zone
$today = date("F j, Y, g:i a"); // March 10, 2001, 5:16 pm
$today = date("m.d.y"); // 03.10.01
$today = date("j, n, Y"); // 10, 3, 2001
$today = date("Ymd"); // 20010310
$today = date('h-i-s, j-m-y, it is w Day'); // 05-16-18, 10-03-01, 1631 1618 6 Satpm01
$today = date('\i\t \i\s \t\h\e jS \d\a\y.'); // it is the 10th day.
$today = date("D M j G:i:s T Y"); // Sat Mar 10 17:16:18 MST 2001
$today = date('H:m:s \m \i\s\ \m\o\n\t\h'); // 17:03:18 m is month
$today = date("H:i:s"); // 17:16:18
$today = date("Y-m-d H:i:s"); // 2001-03-10 17:16:18 (the MySQL DATETIME format)
?>To format dates in other languages, IntlDateFormatter::format() can be used instead of date().
Зауваження:
To generate a timestamp from a string representation of the date, you may be able to use strtotime(). Additionally, some databases have functions to convert their date formats into timestamps (such as MySQL's » UNIX_TIMESTAMP function).
Timestamp of the start of the request is available in $_SERVER['REQUEST_TIME'].
You should be more careful to use NULL in various PHP versions:
<?php
// PHP <=7.4 it'll be 1970-01-01
echo date("Y-m-d", null)); //1970-01-01
// PHP >=8 it'll be current date
echo date("Y-m-d", null)); //2024-09-05