What are the PHP time zone conversion functions?

There are 2 functions: 1. ini_set(), the syntax is "ini_set('date.timezone','identifier)"; 2. date_default_timezone_set(), the syntax is "date_default_timezone_set('identifier')".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

There are two php time zone conversion functions ：

• ini_set() function

• date_default_timezone_set() function

1. Use the ini_set() function to set the time zone

The ini_set() function in PHP can set the time zone by setting the value of the "date.timezone" configuration option.

ini_set('date.timezone', '时区标识符')

There are many time zone identifiers, which can be viewed by visiting "https://www.php.net/manual/zh/timezones.php". Here are some commonly used time zone identifiers And its meaning:

• Asia/Shanghai —— Shanghai

• Asia/Chongqing —— Chongqing

• Asia/Urumqi —— Urumqi

• Asia/Hong_Kong —— Hong Kong

• Asia/Macao —— Macao

• Asia/Taipei - Taipei

• Asia/Singapore - Singapore

• PRC - China Time Zone

Tip: If you are in China, we can set the time zone to "Asia/Shanghai or PRC"!

[Example] Use the ini_set() function to set the time zone

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
ini_set(&#39;date.timezone&#39;, &#39;GMT&#39;);
echo &#39;当前的格林尼治时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time()).&#39;<br>&#39;;
ini_set(&#39;date.timezone&#39;, &#39;Asia/Urumqi&#39;);
echo &#39;乌鲁木齐的当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time()).&#39;<br>&#39;;
ini_set(&#39;date.timezone&#39;, &#39;Asia/Shanghai&#39;);
echo &#39;上海的当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time());
?>

2. Use the date_default_timezone_set() function to set the time zone

The date_default_timezone_set() function in PHP can set a default time zone for all time and date functions in the script. The syntax format is as follows:

date_default_timezone_set($timezone_identifier)

The parameter $timezone_identifier is the time zone identifier, such as UTC ( Greenwich Mean Time) or Europe/Lisbon (Portugal).

Since PHP5.1.0 (the date and time function has been rewritten in this version), if the time zone is illegal, each call to the date and time function will generate an E_NOTICE level error message. If you use the system Setting the or TZ environment variable will also generate E_STRICT level information.

[Example] Use the date_default_timezone_set() function to set the time zone

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
date_default_timezone_set(&#39;Asia/Urumqi&#39;);
echo &#39;乌鲁木齐的当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time()).&#39;<br>&#39;;
date_default_timezone_set(&#39;Europe/Lisbon&#39;);
echo &#39;葡萄牙的当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time()).&#39;<br>&#39;;
date_default_timezone_set(&#39;Asia/Shanghai&#39;);
echo &#39;上海的当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time());
?>

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