


Recently, when I was studying my love scarf, I had to calculate the number of days in love. This requires PHP to calculate based on the daily date. Let’s talk about several methods to achieve this kind of date calculation:
(1) It is very easy if you have a database Yes! If it is MSSQL, you can use triggers! Just use the function datediff() that specially calculates the date difference! If it is MYSQL, use the difference between two date fields to calculate the calculation result and save it in another numeric field! It can be called when needed Yes!
(2) If there is no database, you have to use PHP’s time and date function!
The following is the main explanation: Example: Calculate the number of days from May 3, 1998 to 1999-6-5:
Copy Code The code is as follows:
$startdate=mktime("0","0","0","5","3","1998"); $enddate=mktime("0","0 ","0","6","5","1999"); //The obtained value is the total number of seconds from 1970-1-1 to the parameter time. The result is an integer. Then the following code is easy to compile More
$days=round(($enddate-$startdate)/3600/24);
echo $days;
$days is the number of days obtained; if the parameters in mktime() are default, it means using the current Date, so you can calculate the number of days since the date the book was borrowed.
Finally, let’s talk about the SQL calculation method:
DateDiff function
Description: Returns the time interval between two dates.
Syntax:
Copy code The code is as follows:
DateDiff(interval, date1, date2 [,firstdayofweek[, firstweekofyear>)
interval: required. A string expression used to calculate the time interval between date1 and date2. See the Settings section for values.
date1, date2: required. Date expression. Two dates used for calculation.
firstdayofweek: Optional. A constant that specifies the first day of the week. If not specified, it defaults to Sunday. See the Settings section for values.
firstweekofyear: Optional. Constant that specifies the first week of the year. If not specified, it defaults to the week of January 1st. See the Settings section for values. The
interval parameter can have the following values:
yyyy (year), q (quarter), m (month), y (number of days in a year), d (day), w (number of days in a week), ww (week), h (hour), n (minute), s (second)
firstdayofweek parameter can have the following values:
(The following are: constant value description)
vbUseSystem 0 Use the Regional Language Support (NLS) API setting.
vbSunday 1 Sunday (default)
vbMonday 2 Monday
vbTuesday 3 Tuesday
vbWednesday 4 Wednesday
vbThursday 5 Thursday
vbFriday 6 Friday
vbSaturday 7 Saturday
firstweekofyear The parameter can have the following values:
(The following are: constant value description )
vbUseSystem 0 Use the Locale Language Support (NLS) API setting.
vbFirstJan1 1 Starts with the week of January 1st (default).
vbFirstFourDays 2 starts with the first week of the new year having at least four days.
vbFirstFullWeek 3 starts with the first full week of the new year.
Description: The DateDiff function is used to determine the number of specified time intervals that exist between two dates. For example, you can use DateDiff to calculate the number of days between two dates, or the number of weeks between today and the last day of the year.
To calculate the number of days between date1 and date2, you can use "days in year" ("y") or "day" ("d"). When interval is "day of the week" ("w"), DateDiff returns the number of weeks between two dates. If date1 is a Monday, DateDiff counts the number of Mondays preceding date2. This result contains date2 but not date1. If interval is "week" ("ww"), the DateDiff function returns the number of weeks between two dates in the calendar table. Function counts the number of Sundays between date1 and date2. DateDiff will evaluate date2 if date2 is a Sunday, but not date1 even if date1 is a Sunday.
If date1 is later than date2, the DateDiff function returns a negative number. The
firstdayofweek parameter affects calculations using the "w" and "ww" separator symbols.
If date1 or date2 is a date literal, the specified year becomes a fixed part of the date. But if date1 or date2 is enclosed in quotation marks (" ") and the year is omitted, the current year will be inserted every time the date1 or date2 expression is evaluated in the code. This makes it possible to write program code that works for different years.
When interval is "year" ("yyyy"), compare December 31st with January 1st of the next year. Although the difference is actually only one day, DateDiff returns 1 to indicate a difference of one year.
DatePart function
Description: Returns the specified part of the given date.
Syntax:
Copy code The code is as follows:
DatePart(interval, date[, firstdayofweek[, firstweekofyear>)
DatePart: The syntax of the function has the following parameters:
interval: Required. A string expression representing the time interval to be returned. See the Settings section for values.
date: required. The date expression to evaluate.
firstdayof week: Optional. A constant that specifies the first day of the week. If not specified, it defaults to Sunday. See the Settings section for values.
firstweekofyear: Optional. Constant that specifies the first week of the year. If not specified, it defaults to the week of January 1st. See the Settings section for values. The
interval parameter can have the following values:
yyyy (year), q (quarter), m (month), y (number of days in a year), d (day), w (number of days in a week), ww (week), h (hour), n (minute), s (second)
firstdayofweek parameter can have the following values:
(The following are: constant value description)
vbUseSystem 0 Use the Regional Language Support (NLS) API setting.
vbSunday 1 Sunday (default)
vbMonday 2 Monday
vbTuesday 3 Tuesday
vbWednesday 4 Wednesday
vbThursday 5 Thursday
vbFriday 6 Friday
vbSaturday 7 Saturday
firstweekofyear The parameter can have the following values:
(The following are: constant value description )
vbUseSystem 0 Use the Locale Language Support (NLS) API setting.
vbFirstJan1 1 Starts with the week of January 1st (default).
vbFirstFourDays 2 starts with the first week of the new year having at least four days.
vbFirstFullWeek 3 starts with the first full week of the new year (not across years).
Description: The DatePart function is used to calculate dates and return the specified time interval. For example, use DatePart to calculate the day of the week or the current time. The
firstdayofweek parameter affects calculations using the "w" and "ww" interval symbols.
If date is a date literal, the specified year becomes a fixed part of the date. But if date is enclosed in quotation marks (" ") and the year is omitted, the current year will be inserted every time the date expression is evaluated in the code. This way you can write program code that works for different years!
The above introduces the solution to the problem that cf cannot full screen win7. The method of calculating the time difference in PHP and MySql, including the solution to the problem that cf cannot full screen win7. I hope it will be helpful to friends who are interested in PHP tutorials.

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

PHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

The article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.

Alipay PHP...


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.