PHP Doku:: Returns new DateTime object - datetime.construct.html

Verlauf / Chronik / History: (1) anzeigen

Sie sind hier:
Doku-StartseitePHP-HandbuchFunktionsreferenzDatums- und zeitrelevante ErweiterungenDatum und UhrzeitThe DateTime classDateTime::__construct

Ein Service von Reinhard Neidl - Webprogrammierung.

The DateTime class

<<DateTime::add

DateTime::createFromFormat>>

DateTime::__construct

(PHP 5 >= 5.2.0)

DateTime::__constructReturns new DateTime object

Beschreibung

Objektorientierter Stil

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

Prozeduraler Stil

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

Returns new DateTime object.

Parameter-Liste

time

A date/time string. Gültige Formate werden unter Datums- und Zeitformate erläutert.

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.

Hinweis:

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).

Rückgabewerte

Returns a new DateTime instance. Prozeduraler Stil returns FALSE on failure.

Fehler/Exceptions

Emits Exception in case of an error.

Changelog

Version Beschreibung
5.3.0 If an invalid date is specified, then an exception is now thrown. Previously an error was emitted.

Beispiele

Beispiel #1 DateTime::__construct() example

Objektorientierter Stil

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

echo 
$date->format('Y-m-d');
?>

Prozeduraler Stil

<?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');
?>

The above examples will output:

2000-01-01

Beispiel #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";
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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

Siehe auch


3 BenutzerBeiträge:
- Beiträge aktualisieren...
Tim Strehle
5.05.2010 12:50
"The $timezone parameter and the current timezone are ignored when the $time parameter […] is a UNIX timestamp."

Watch out – this means that these two are NOT equivalent, they result in different timezones (unless your current timezone is GMT):

<?php
$d
= new DateTime(); $d->setTimestamp($t);
echo
$o->format('O');
// +0200

$d = new DateTime('@' . $t);
echo
$o->format('O');
// +0000
?>
kendsnyder at gmail dot com
12.01.2010 17:37
Also forgot to mention, that MySQL "zeroed" dates do not throw an error but produce a non-sensical date:

<?php

$d
= new DateTime("0000-00-00");
$d->format("Y-m-d"); // "-0001-11-30"

?>

Another good reason to write your own class that extends from DateTime.
kendsnyder at gmail dot com
12.01.2010 17:24
The theoretical limits of the date range seem to be "-9999-01-01" through "9999-12-31" (PHP 5.2.9 on Windows Vista 64):

<?php

$d
= new DateTime("9999-12-31");
$d->format("Y-m-d"); // "9999-12-31"

$d = new DateTime("0000-12-31");
$d->format("Y-m-d"); // "0000-12-31"

$d = new DateTime("-9999-12-31");
$d->format("Y-m-d"); // "-9999-12-31"

?>

Dates above 10000 and below -10000 do not throw errors but produce weird results:

<?php

$d
= new DateTime("10019-01-01");
$d->format("Y-m-d"); // "2009-01-01"

$d = new DateTime("10009-01-01");
$d->format("Y-m-d"); // "2009-01-01"

$d = new DateTime("-10019-01-01");
$d->format("Y-m-d"); // "2009-01-01"

?>



PHP Powered Diese Seite bei php.net
The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)