What are the php+date functions?

php date functions include: 1. `date()` function; 2. `time()` function; 3. `strtotime()` function; 4. `date_default_timezone_set()` function; 5. ` date_create()` and `date_format()` functions.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a programming language widely used in web development. It provides many built-in functions to handle dates and times, the most commonly used of which are date and time functions. These functions help us get, format, and manipulate dates and times.

The following are some common PHP date functions:

1. `date()` function: used to get the current date and time. Dates and times can be presented in different formats by passing the format parameter. For example, `date('Y-m-d')` will return the current date in the format of "year-month-day".

Sample code:

$today=date('Y-m-d');
echo"今天的日期是：".$today;

2. `time()` function: used to get the current Unix timestamp. A Unix timestamp is the number of seconds since January 1, 1970. We can use this timestamp for calculations and comparisons. For example, you can calculate the number of days between two dates by subtracting the difference between two timestamps.

Sample code:

$timestamp=time();
echo"当前的Unix时间戳是：".$timestamp;

3. `strtotime()` function: used to convert human-readable date and time strings to Unix timestamps. This function can parse various date and time formats, such as "YYYY-MM-DD", "YYYY/MM/DD", "Month Day, Year", etc.

Sample code:

$dateString='2022-12-31';
$timestamp=strtotime($dateString);
echo"日期字符串的Unix时间戳是：".$timestamp;

4. `date_default_timezone_set()` function: used to set the default time zone. By default, PHP uses the server's time zone setting. But we can use this function to change the default time zone. Time zone information can be obtained from the time zone database on the php.net website.

Sample code:

date_default_timezone_set('Asia/Shanghai');

5. `date_create()` and `date_format()` functions: used to create a date object and format it. The `date_create()` function is used to create date objects, while the `date_format()` function is used to format date objects into strings.

Sample code:

$date=date_create('2022-09-15');
$formattedDate=date_format($date,'Y-m-d');
echo"格式化后的日期是：".$formattedDate;

These are some commonly used PHP date functions. They can help us handle and manipulate dates and times effectively in web development. Whether it is getting the current date and time, or formatting, comparing, and calculating dates, these functions provide convenient and powerful functions. Learning these functions well will help you develop better web applications .

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