DateTimeImmutable::__construct

date_create_immutable

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

DateTimeImmutable::__construct -- date_create_immutableReturns new DateTimeImmutable object

说明

面向对象风格

public DateTimeImmutable::__construct(string $datetime = "now", ?DateTimeZone $timezone = null)

过程化风格

date_create_immutable(string $datetime = "now", ?DateTimeZone $timezone = null): DateTimeImmutable|false

Returns new a DateTimeImmutable object.

参数

datetime

日期/时间字符串。正确格式的说明详见 日期与时间格式

Enter "now" here to obtain the current time when using the $timezone parameter.

timezone

A DateTimeZone object representing the timezone of $datetime.

If $timezone is omitted or null, the current timezone will be used.

注意:

The $timezone parameter and the current timezone are ignored when the $datetime parameter either is a UNIX timestamp (e.g. @946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00, or 2010-07-05T06:00:00Z).

返回值

Returns a new DateTimeImmutable instance. 过程化风格在失败时返回 false

错误/异常

Emits Exception in case of an error.

更新日志

版本 说明
7.1.0 From now on microseconds are filled with actual value. Not with '00000'.

范例

示例 #1 DateTimeImmutable::__construct() example

面向对象风格

<?php
try {
    
$date = new DateTimeImmutable('2000-01-01');
} catch (
Exception $e) {
    echo 
$e->getMessage();
    exit(
1);
}

echo 
$date->format('Y-m-d');
?>

过程化风格

<?php
$date 
date_create('2000-01-01');
if (!
$date) {
    
$e date_get_last_errors();
    foreach (
$e['errors'] as $error) {
        echo 
"$error\n";
    }
    exit(
1);
}

echo 
date_format($date'Y-m-d');
?>

以上例程会输出:

2000-01-01

示例 #2 Intricacies of DateTimeImmutable::__construct()

<?php
// Specified date/time in your computer's time zone.
$date = new DateTimeImmutable('2000-01-01');
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Specified date/time in the specified time zone.
$date = new DateTimeImmutable('2000-01-01', new DateTimeZone('Pacific/Nauru'));
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Current date/time in your computer's time zone.
$date = new DateTimeImmutable();
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Current date/time in the specified time zone.
$date = new DateTimeImmutable('now', new DateTimeZone('Pacific/Nauru'));
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Using a UNIX timestamp.  Notice the result is in the UTC time zone.
$date = new DateTimeImmutable('@946684800');
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Non-existent values roll over.
$date = new DateTimeImmutable('2000-02-30');
echo 
$date->format('Y-m-d H:i:sP') . "\n";
?>

以上例程的输出类似于:

2000-01-01 00:00:00-05:00
2000-01-01 00:00:00+12:00
2010-04-24 10:24:16-04:00
2010-04-25 02:24:16+12:00
2000-01-01 00:00:00+00:00
2000-03-01 00:00:00-05:00

示例 #3 Changing the associated timezone

<?php
$timeZone 
= new \DateTimeZone('Asia/Tokyo');

$time = new \DateTimeImmutable();
$time $time->setTimezone($timeZone);

echo 
$time->format('Y/m/d H:i:s'), "\n";
?>

以上例程的输出类似于:

2022/08/12 23:49:23

示例 #4 Using a relative date/time string

<?php
$time 
= new \DateTimeImmutable("-1 year");

echo 
$time->format('Y/m/d H:i:s'), "\n";
?>

以上例程的输出类似于:

2021/08/12 15:43:51
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User Contributed Notes 1 note

up
0
wangbuying at gmail dot com
3 years ago
As the type of the first parameter is string, we can assign a relative date for it.
Example:

<?php
$immutable
= new DateTimeImmutable('-1 year', new DateTimeZone('Asia/ShangHai'));
echo
$immutable->format('Y-m-d H:i:s');
?>

It looks like the parameter of function strtotime and is very helpful for us to get an immutable relative DateTime object.
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