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This article mainly introduces the difference between date and gmdate in PHP and the default time zone settings. For more information, see
I. What is the difference between date and gmdate?The PHP time function has two formatting functions: date ()
The time in PHP has two formatting functions: Date () and gmdate (), which are described in the official document as follows:
Date-format a local time/date
Gmdate-format a gmt/UTC date/time and return the Greenwich Mean Time (GMT ).
For example, if
The function of the date command is to display and set the system date and time.
The general format for this command is: date [options] Displays the time format (beginning with +, followed by formatting)
Date set time format
The meanings of the
DateCommandThe function of the date command is to display and set the system date and time.The general format for this command is: date [options] Displays the time format (beginning with +, followed by formatting)Date set time formatThe meanings of
Http://www.linuxidc.com/Linux/2010-09/28537.htmThe exchange of date and timestamp under Linux1. Date to timestamp:$ Date-d ' 2009-12-01 23:20 ' +%s 12596808002. Timestamp to date$ Date-d ' 1970-01-01 1259680800 sec UTC ' Tue Dec 1 23:20:00 CST 20093.
In the CentOS 6 version, the time setting has the date, Hwclock command, starting with CentOS 7, using a new command timedatectl.
I. Basic CONCEPTS
1.1 GMT, UTC, CST, DST time
(1) UTC
The whole earth is divided into 24 time zones, each of which
On the concept of time zones, in fact, junior high school geography has been involved, many people have some understanding of some, may be just the details do not understand. Why would the Earth be divided into different time zones? Because the
Xen Virtual Machine linux system time settings have not been expected to become a problem, but because of the special requirements in the project, the server needs to be set to China Standard Time. So I studied it. It turns out that after the
About GMT and UTCFirst, IntroductionMany people know that the two-way schedule is referred to as GMT or UTC, and the World Time Zone table is referred to as universal, so what is the actual intent of GMT and UTC? How is the world time zone
In the previous tutorial you may have read XML parsing using PHP (in the middle, the full XML parser takes the first class, which takes tons of line code and extra time.) In PHP5, we can use simple XML classes to parse XML quickly in only two lines
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