Detailed explanation of common methods of php DateTime
This article organizes some methods used by DateTime objects to facilitate everyone's search and browsing. You can refer to them if necessary.
Preface
Placing \ in front of the instantiated object indicates that the native class is used in the namespace. If the namespace is not used, you can delete the previous \
1. Output the current time
$datetime = new \DateTime; print_r($datetime->format('Y-m-d H:i:s'));
2. Output the given time
$datetime = new \DateTime('2016-06-13'); print_r($datetime);
3. Format the given time to the time you want
$datetime = \DateTime::createFromFormat('Ymd', '20160618'); print_r($datetime->format('Y-m-d'));
4. Output Unix timestamp format (method 1 will return a negative number if it is before 1990, and method 2 will return false)
//方法1(php5.2)： $datetime = new \DateTime(); echo $datetime->format('U');exit; //方法2(php5.3)推荐 $datetime = new \DateTime(); echo $datetime->getTimestamp();exit;
5. Format to the given time based on the given timestamp
$datetime = new \DateTime(); $datetime->setTimestamp(1465783744); echo $datetime->format('Y-m-d H:i:s');
6. Compare two dates and times, compare year to year, compare month to month...
$datetime1 = new \DateTime('2016-01-01 10:11:18'); $datetime2 = new \DateTime('2017-05-11 22:21:21'); $interval = $datetime1->diff($datetime2); print_r($interval->format('%Y'));//%表示使用格式化，R表示是大于这个日期(+)，还是小于这个日期（-）,a表示大于或小于多少天，时分秒正常使用y,m,d,h,i,s
7. Create a time with a length of several days ago
DateInterval constructionThe parameter of the function is a string representing the time interval agreement. This time interval agreement starts with the letter P, followed by integer, and finally a period identifier qualifying the preceding integer. Valid period identifiers are as follows: Y (year) M (month) D (day) W (week) H (hour) M (minute) S (second) The interval agreement can have both time and date, if time is needed Add the letter T between the date and time. For example, the interval convention P2D means an interval of two days, and the interval convention P2DT5H2M means an interval of two days, five hours and two minutes.
$datetime = new \DateTime(); $interval = new \DateInterval('P2DT5H'); //或者使用createFromDateString方法 //$interval = \DateInterval::createFromDateString('1 month'); //修改DateTime实例 $datetime->add($interval); echo $datetime->format('Y-m-d H:i:s');
8. Create the time a few days ago
$datetime = new \DateTime(); $interval = new \DateInterval('P2DT5H'); $datetime->sub($interval); echo $datetime->format('Y-m-d H:i:s'); //ps:有个modify方法，这个方法是减去30，并不是像前推1天，输出的还是12月 $datetime = new \DateTime('2014/12/31'); $datetime->modify( '-1 month' ); print_r($datetime);exit;
9. Reset the time of the current DateTime object Different dates, pass year, month, day
$datetime = new \DateTime(); $datetime->setDate(2015, 2, 28); echo $datetime->format('Y-m-d');exit;
10. Reset the time of the current DateTime object to different times, pass hours, minutes, seconds ( Optional parameters)
$datetime = new \DateTime(); $datetime->setTime(20, 20, 24); echo $datetime->format('Y-m-d H:i:s');exit;
11. Change the time zone before formatting the time
$timezone = new \DateTimeZone('Asia/Calcutta'); $datetime = new \DateTime(); $datetime->setTimezone($timezone); print_r($datetime->format('Y-m-d H:i:s'));exit;
12. Return the time zone
$date = new \DateTime(null, new DateTimeZone('Asia/Shanghai')); $tz = $date->getTimezone(); echo $tz->getName();
13. Calculate the offset value of two time zones
$dateTimeZoneTaipei = new \DateTimeZone("Asia/Taipei");
$dateTimeZoneJapan = new \DateTimeZone("Asia/Tokyo");
$dateTimeTaipei = new \DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new \DateTime("now", $dateTimeZoneJapan);
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);
print_r($timeOffset);exit;14. Return the time interval, how long
$interval = new \DateInterval('P2Y4DT6H8M'); echo $interval->format('%d days');
15. Iterate and output the days before the current date.
Constructor method of DatePeriod classAccepts three parameters and must provide a DateTime instance, indicating the date and time when the iteration starts, and a DateInterval instance, indicating the next date The interval between it and time is an integer, indicating the total number of iterations. The fourth parameter is optional and is used to explicitly specify the end date and time of the cycle. If you want to exclude the start date and time when iterating, you can put the last part of the constructor One parameter is set to DatePeriod::EXCLUDE_START_DATEConstant:
$datetime = new \DateTime();
$interval = \DateInterval::createFromDateString('-1 day');
$period = new \DatePeriod($datetime, $interval, 3);
foreach ($period as $date) {
echo $date->format('Y-m-d'), PHP_EOL;
}The above is the detailed content of Detailed explanation of common methods of php DateTime. 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.
