PHP 8.1.6 Released!

日期和时间

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User Contributed Notes 2 notes

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6
Moo0z0r
11 years ago
I think it's important to mention with the DateTime class that if you're trying to create a system that should store UNIX timestamps in UTC/GMT, and then convert them to a desired custom time-zone when they need to be displayed, using the following code is a good idea:

<?php
date_default_timezone_set
('UTC');
?>

Even if you use something like:

<?php
$date
->setTimezone( new DateTimeZone('UTC') );
?>

... before you store the value, it doesn't seem to work because PHP is already trying to convert it to the default timezone.
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0
theking2 at king dot ma
1 month ago
If working with SQL databases it is important to realize that where DB normally reserve 0000-00-00 as a special value for indicating not valid date.

If this was converted in PHP, unexpected things happen.

<?php

$s
= "0000-00-00 00:00:00";
$d = \DateTime::createFromFormat('Y-m-d H:i:s',$s);
echo
$d-> format("d.m.Y H:i:s");

// 30.11.-0001 00:00:00
?>

Available on https://3v4l.org/jnoIJ
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