Returns new DateTimeImmutable object

# DateTimeImmutable::__construct

# date_create_immutable

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

DateTimeImmutable::__construct -- date_create_immutable — Returns new DateTimeImmutable object

### 说明

面向对象风格

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

过程化风格

function 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.

### 错误／异常

If an invalid Date/Time string is passed, DateMalformedStringException is thrown. Previous to PHP 8.3, this was Exception.

### 更新日志

版本 | 说明
--- | ---
8.3.0 | Now throws DateMalformedStringException if an invalid string is passed, instead of Exception.
7.1.0 | From now on microseconds are filled with actual value. Not with '00000'.

### 示例

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');

以上示例会输出：

    2000-01-01

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');

以上示例会输出：

    2000-01-01

示例 #2 Intricacies of DateTimeImmutable::__construct()

    <?php
    date_default_timezone_set('America/Jamaica');

    // Specified date/time in PHP's default 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 PHP's default 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";

以上示例的输出类似于：

    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

> 注意:

> Rolled over dates can be detected by checking for warnings using DateTimeImmutable::getLastErrors().

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 e'), "\n";

以上示例的输出类似于：

    2022/08/12 23:49:23 Asia/Tokyo

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";

以上示例的输出类似于：

    2021/08/12 15:43:51

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