DateTime
PHP Manual

DateTime::__construct

(PHP 5 >= 5.2.0)

DateTime::__constructReturns new DateTime object

说明

面向对象风格

public DateTime::__construct() ([ string $time = "now" [, DateTimeZone $timezone = NULL ]] )

过程化风格

DateTime date_create ([ string $time = "now" [, DateTimeZone $timezone = NULL ]] )

Returns new DateTime object.

参数

time

日期/时间字符串。正确格式的说明详见 日期与时间格式.

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

timezone

A DateTimeZone object representing the desired time zone.

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

Note:

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

返回值

Returns a new DateTime 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
5.3.0 If an invalid date is specified, then an exception is now thrown. Previously an error was emitted.

范例

Example #1 DateTime::__construct() example

面向对象风格

<?php
try {
    
$date = new DateTime('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

Example #2 Intricacies of DateTime::__construct()

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

// Specified date/time in the specified time zone.
$date = new DateTime('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 DateTime();
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Current date/time in the specified time zone.
$date = new DateTime(null, 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 DateTime('@946684800');
echo 
$date->format('Y-m-d H:i:sP') . "\n";

// Non-existant values roll over.
$date = new DateTime('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

参见


DateTime
PHP Manual