PHPdate () function to obtain the current date and time instance details

When we explain how to obtain the current timestamp instance, we use the date () function to obtain the current time and date. This chapter will introduce it to you, returns the "date" function of the current date and time. In PHP, the date () function is used to obtain the current time and date. The syntax format is as follows, we used Date () functionThis section describes how to obtain the "date" function of the current date and time.

Date function usage

In PHP, use the date () function to obtain the current time and date. The syntax format is as follows:

date(format,timestamp);

The date () function returns the string generated by the timestamp parameter in the specified format. the timestamp parameter is optional. If this parameter is not specified, the current time is used. The format parameter allows developers to output dates in the specified format. For details about formatting, we have written several chapters specifically. here we can refer to php-weizijiaocheng-360500.html.

Here are some predefined constants of time and date, as shown in the following table. these constants provide standard date expressions for date format functions.

Predefined Constants of time and date

Predefined Constants	Description
DATE_ATOM	Atomic clock format
DATE_COOKIE	HTTP Cookies
DATE_ISO8601	ISO-8601 format
DATE_RFC822	RFC822 format
DATE_RFC850	RFC850 format
DATE_RSS	WORSS format
DATE_W3C	World Wide Web Consortium format

The following example shows the differences between constants.

Date function Example 1

This example shows how to use the date () function. the code is as follows:

 "; // Output the current date?>

Code running result:

Date function Example 2

This example compares the output of various constants. the sample code is as follows:

 ";echo "DATE_COOKIE=".date(DATE_COOKIE)."
";echo "DATE_ISO8601=".date(DATE_ISO8601)."
";echo "DATE_RFC822=".date(DATE_RFC822)."
";echo "DATE_RFC850=".date(DATE_RFC850)."
";echo "DATE_RSS=".date(DATE_RSS)."
";echo "DATE_W3C=".date(DATE_W3C );?>

Code running result:

The above is the output of the predefined constant. Next section describes how to obtain date information in PHP.

The above is the detailed description of the current date and time instance obtained by The PHP date () function. For more information, see other related articles in the first PHP community!