PHP timestamp and time zone concepts
The diversification and similar functions of PHP functions are really a major feature. The same application can be implemented with multiple functions, which is probably a drawback of open source; through the systematic study of PHP time functions, I fully understand the time stamp and The concept of time zone (this is really important), friends in need can refer to it.
All functions in PHP are from the UNIX era, that is, starting from January 1, 1970.
The date is the number of seconds since this time.
When a function calls the number of seconds since this time, treat it as a (timestamp) timestamp.
Local time function
1. string date(string format,inieger timestamp)
This function returns a string representing the time, which is String format controlled.
For example:
<?
print(date("Y年 m月d日");//输出当前,年月日.
print(date("Y年 m月d日",60*60*24*365*10);//输出1980年1月1日.
?>Maybe you will ask, why is there no timestamp? If timestamp is empty, or does not write, it means that the current time timestamp is used.
The control character indicating the year: Y ---four-digit year y---two-digit year
represents the control character of the month: m---month from 1-12 F---English month name M---abbreviated month name
The control character indicating the day number: d---The day in the month with 0 in front j--The day number without 0 in front
The control character indicating the week: l--English week D--Abbreviated week
represents the hour control character: h--hours from 1 to 12 H---hours from 0 to 23
represents the control character for morning and afternoon a ---am or pm A---AM or PM
represents the minute control character: i---value 00-59
represents the number of days in a year: z--the number of days in a year
2. array getdate(integer timestamp)
This function returns a matrix.
For example:
<?
$current_date=getdate();
print($current_date("hours"));
print($current_date("minutes");
print($current_date("seconds");
?>Description:
Element description
hours Hours in 24-hour format
mday Date in month
minutes Minutes
mon Month in numeric form
month Full name of month
seconds Number of seconds
wday Day of the week in numeric form from 0 to 6
weekday Day of the week The name of (integer month, integer day, integer year)
This function checks whether the date is legal. For example:
<?
if(checkdate(2,29,1980))
print("日期合法!n");
?>4. integer time()
This function obtains Current timestamp. For example:
<? print(time());//输出一大串整数 ?>
5. integer mktime(integer hour,integer minutes,integer seconds,integer month, integer day,integer year)
This function Returns the timestamp of the given date, that is, the number of seconds from January 1, 1970 to the present.
If a parameter is out of range, this function can also interpret it, for example, 13th is January of the next year. Such as: <?
$currenthour=date("H");
print("50个小时后为:");
print(date("h:i A l F dS,Y",mktime($currenthour+50)));
print("<br>n");
?>
This function returns a string consisting of the milliseconds of the current time and the seconds starting from 1970. Number
<?
print("start:microtime()<br>n");
for($index=0;$index<1000;$index++)
print("good!");
print("stop:microtime()<br>n");
?>Also, various Linwich Mean Time functions
Summary: The above is the entire content of this article, I hope it can be helpful to everyone’s study .
Related recommendations:php method to create an intelligent histogram program
PHP is implementing extraction Method of English initialsPHP Chinese round seal class
The above is the detailed content of PHP timestamp and time zone concepts. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
