Code in PHP to calculate the date, year, month and day based on the day of the year_PHP Tutorial

In addition to recording and searching instant noodles data, this index value also plays the role of recording date information, and the amount of information is considerable.
So, how to restore the index value to available date information?
date('z') returns the day of the year, and the return value is an integer starting from 0 to 365. To restore these integers to date information, we just need a simple calculation. Taking the 159th day of this year (2008) (actually 160 days, starting from 0 in PHP, 0 corresponds to the regular first day) as an example, the method for calculating its date and week is as follows:

Copy code The code is as follows:

$MyDate=159; //Day 159
$milliseconds = mktime(0 ,0,0,1,1,2008) + $MyDate * 86400; //Get UNIX timestamp
$msg = date('F jS Y , l',$milliseconds); //Format date output
echo $msg;
?>

Run the above program, the information displayed on the browser will be: June 8th 2008, Sunday
Explanation:
1. $milliseconds is a UNIX timestamp variable, which indicates the number of milliseconds since the UNIX era (January 1, 1700) experienced on the 159th day of 2008. It will be used as a parameter for the date() function It is an important basis for participating in calculating date information. To correctly calculate the value of $milliseconds, we first need to get the number of milliseconds experienced on January 1, 2008, that is, mktime(0,0,0,1,1,2008), and then add the number of milliseconds in 159 days, That is, $MyDate * 86400, since there are 86400 milliseconds in each day.
2. $msg is the date information we format and output. The value of this variable is obtained through the date() function. The first parameter "'F jS Y, l'" is just the formatting format, and can also be set as needed. For others, the second parameter is the number of milliseconds (long integer), which means the total number of milliseconds that have elapsed from the beginning of UNIX to a specific moment.
In order to verify the correctness of the program, we can print the number of milliseconds experienced on June 8, 2008: mktime(0,0,0,6,8,2008), its value will be the same as $milliseconds of: 1212854400.

http://www.bkjia.com/PHPjc/322924.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322924.htmlTechArticleIn addition to recording and searching instant noodles data, this index value also plays a role in recording date information, and the amount of information is considerable. . So, how to restore the index value to available date information? da...