哪个PHP函数可以返回当前日期/时间?


当前回答

使用date()和DateTimeInterface::format格式化日期,即date('Y-m-d H:i:s');,你有这些可选格式:

来源:DateTimeInterface:::格式页面。

format character Description Example returned values
Day --- ---
d Day of the month, 2 digits with leading zeros 01 to 31
D A textual representation of a day, three letters Mon through Sun
j Day of the month without leading zeros 1 to 31
l (lowercase 'L') A full textual representation of the day of the week Sunday through Saturday
N ISO 8601 numeric representation of the day of the week 1 (for Monday) through 7 (for Sunday)
S English ordinal suffix for the day of the month, 2 characters st, nd, rd or th. Works well with j
w Numeric representation of the day of the week 0 (for Sunday) through 6 (for Saturday)
z The day of the year (starting from 0) 0 through 365
Week --- ---
W ISO 8601 week number of year, weeks starting on Monday Example: 42 (the 42nd week in the year)
Month --- ---
F A full textual representation of a month, such as January or March January through December
m Numeric representation of a month, with leading zeros 01 through 12
M A short textual representation of a month, three letters Jan through Dec
n Numeric representation of a month, without leading zeros 1 through 12
t Number of days in the given month 28 through 31
Year --- ---
L Whether it's a leap year 1 if it is a leap year, 0 otherwise.
o ISO 8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. Examples: 1999 or 2003
X An expanded full numeric representation of a year, at least 4 digits, with - for years BCE, and + for years CE. Examples: -0055, +0787, +1999, +10191
x An expanded full numeric representation if requried, or a standard full numeral representation if possible (like Y). At least four digits. Years BCE are prefixed with a -. Years beyond (and including) 10000 are prefixed by a +. Examples: -0055, 0787, 1999, +10191
Y A full numeric representation of a year, at least 4 digits, with - for years BCE. Examples: -0055, 0787, 1999, 2003, 10191
y A two digit representation of a year Examples: 99 or 03
Time --- ---
a Lowercase Ante meridiem and Post meridiem am or pm
A Uppercase Ante meridiem and Post meridiem AM or PM
B Swatch Internet time 000 through 999
g 12-hour format of an hour without leading zeros 1 through 12
G 24-hour format of an hour without leading zeros 0 through 23
h 12-hour format of an hour with leading zeros 01 through 12
H 24-hour format of an hour with leading zeros 00 through 23
i Minutes with leading zeros 00 to 59
s Seconds with leading zeros 00 through 59
u Microseconds. Note that date() will always generate 000000 since it takes an int parameter, whereas DateTime::format() does support microseconds if DateTime was created with microseconds. Example: 654321
v Milliseconds. Same note applies as for u. Example: 654
Timezone --- ---
e Timezone identifier Examples: UTC, GMT, Atlantic/Azores
I (capital i) Whether or not the date is in daylight saving time 1 if Daylight Saving Time, 0 otherwise.
O Difference to Greenwich time (GMT) without colon between hours and minutes Example: +0200
P Difference to Greenwich time (GMT) with colon between hours and minutes Example: +02:00
p The same as P, but returns Z instead of +00:00 (available as of PHP 8.0.0) Examples: Z or +02:00
T Timezone abbreviation, if known; otherwise the GMT offset. Examples: EST, MDT, +05
Z Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive. -43200 through 50400
Full Date/Time --- ---
c ISO 8601 date 2004-02-12T15:19:21+00:00
r » RFC 2822/» RFC 5322 formatted date Example: Thu, 21 Dec 2000 16:01:07 +0200
U Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT) See also time()

其他回答

Use:

$date = date('m/d/Y h:i:s a', time());

它的工作原理。

从PHP 5.2.0开始,你可以使用DateTime()类:

use \Datetime;

$now = new DateTime();
echo $now->format('Y-m-d H:i:s');    // MySQL datetime format
echo $now->getTimestamp();           // Unix Timestamp -- Since PHP 5.3

并指定时区:

$now = new DateTime(null, new DateTimeZone('America/New_York'));
$now->setTimezone(new DateTimeZone('Europe/London'));    // Another way
echo $now->getTimezone();

时间会随着服务器时间流逝。一个简单的解决方法是在调用date()或time()函数之前使用date_default_timezone_set手动设置时区。

我在澳大利亚墨尔本,所以我有这样的东西:

date_default_timezone_set('Australia/Melbourne');

或者另一个例子是洛杉矶-美国:

date_default_timezone_set('America/Los_Angeles');

你还可以通过以下命令查看服务器当前所在的时区:

date_default_timezone_get();

比如:

$timezone = date_default_timezone_get();
echo "The current server timezone is: " . $timezone;

所以你问题的简短答案是:

// Change the line below to your timezone!
date_default_timezone_set('Australia/Melbourne');
$date = date('m/d/Y h:i:s a', time());

那么所有的时间都将是你刚刚设置的时区:)

您可以使用$_SERVER['REQUEST_TIME']变量(自PHP 5.1.0起可用)或time()函数来获取当前的Unix时间戳。

根据如何使用PHP获取当前日期时间(NOW)这篇文章,有两种常见的方法来获取当前日期。要在PHP中获取当前的日期时间(now),您可以在任何PHP版本中使用date类,或者在PHP >= 5.2中使用datetime类。

这里有各种日期格式表达式。

使用日期的示例

该表达式将以Y-m-d H:i:s格式返回NOW。

<?php
    echo date('Y-m-d H:i:s');
?>

使用datetime类的示例

该表达式将以Y-m-d H:i:s格式返回NOW。

<?php
    $dt = new DateTime();
    echo $dt->format('Y-m-d H:i:s');
?>