What should I do if the time displayed in php is different from the actual time?

Solution: 1. Use "ini_set('date.timezone','PRC')" to set the time zone; 2. Use "date_default_timezone_set('PRC')" to set the time zone; 3. In the configuration file, Set "date.timezone=PRC".

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

In PHP, the displayed time is inconsistent with the actual time , because the time zone setting is wrong.

The world is divided into 24 time zones. Each time zone has its own local time. The local time of each time zone differs from 1 to 23 hours at the same time. For example, the local time in London, UK, and the local time in Beijing differ by 8 hours. .

If you want to set the displayed time to be the same as the actual time, you need to set the time zone to the local time zone. Here are some common time zone identifiers and their meanings:

• 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

Note: If we are in China, we will change the time zone It can be set to "Asia/Shanghai or PRC". Remember to restart the server after the setting is successful!

Let’s take a look at how to set the time zone:

Method 1: Use the ini_set() function to set the time zone

In PHP The ini_set() function can set the value of a specified configuration option. This configuration option will maintain the new value while the script is running, and restore it when the script ends. The syntax format of the function is as follows:

ini_set($varname, $newvalue)

where $varname is the configuration option to be modified, and $newvalue is the new value of the configuration option.

Example:

<?php
header("Content-type:text/html;charset=utf-8"); 
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;PRC&#39;);
echo &#39;国内当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time());
?>

Output result:

##Method 2: Use date_default_timezone_set() function Set 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 symbol, 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 or The TZ environment variable also generates E_STRICT level information.

Example:

<?php
header("Content-type:text/html;charset=utf-8"); 
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;PRC&#39;);
echo &#39;国内当前时间为：&#39;.date(&#39;Y-m-d H:i:s&#39;,time());
?>

Output result:

##Method 3: Set

in the configuration file php.ini The configuration file of PHP is the php.ini file in the PHP installation directory. Find and open it. Then search for date.timezone in the file, we will see a piece of information as shown below:

[Date]
; Defines the default timezone used by the date functions
; http://php.net/date.timezone
;date.timezone =

where

;date.timezone =

the ; in front of it is the same as PHP The // has the same function and means a comment. Here we need to remove this; and fill in the corresponding time zone identifier after = in this sentence, as shown below : <pre class="brush:php;toolbar:false">[Date] ; Defines the default timezone used by the date functions ; http://php.net/date.timezone date.timezone = PRC</pre>

Extended knowledge: Time zone identifiers that can be set in Asia

Asia/Aden	Asia/Almaty	Asia/Amman	Asia/Anadyr
Asia/Aqtau	Asia/Aqtobe	Asia/Ashgabat	Asia/Atyrau
Asia/Baghdad	Asia/Bahrain	Asia/Baku	Asia/Bangkok
Asia/Barnaul	Asia/Beirut	Asia/Bishkek	Asia/Brunei
Asia/Chita	Asia/Choibalsan	Asia/ Colombo	Asia/Damascus
Asia/Dhaka	Asia/Dili	Asia/Dubai	Asia /Dushanbe
Asia/Famagusta	Asia/Gaza	Asia/Hebron	Asia/Ho_Chi_Minh
Asia/Hong_Kong	Asia/Hovd	Asia/Irkutsk	Asia/Jakarta
Asia/ Jayapura	Asia/Jerusalem	Asia/Kabul	Asia/Kamchatka
Asia/Karachi	Asia /Kathmandu	Asia/Khandyga	Asia/Kolkata
Asia/Krasnoyarsk	Asia/Kuala_Lumpur	Asia/Kuching	Asia/Kuwait
Asia/Macau	Asia/Magadan	Asia/Makassar	Asia/Manila
Asia/Muscat	Asia/Nicosia	Asia/Novokuznetsk	Asia/Novosibirsk
Asia/Omsk	Asia/Oral	Asia/Phnom_Penh	Asia/Pontianak
Asia/Pyongyang	Asia/Qatar	Asia/Qostanay	Asia/Qyzylorda
Asia/Riyadh	Asia/Sakhalin	Asia/Samarkand	Asia/Seoul
Asia/Shanghai	Asia/Singapore	Asia/Srednekolymsk	Asia/Taipei
Asia/Tashkent	Asia/Tbilisi	Asia/Tehran	Asia/Thimphu
Asia/Tokyo	Asia/Tomsk	Asia/Ulaanbaatar	Asia/Urumqi
Asia/Ust-Nera	Asia/Vientiane	Asia/Vladivostok	Asia/Yakutsk
Asia/Yangon	Asia/Yekaterinburg	Asia/Yerevan

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