PHP time and date calculation (addition and subtraction) function_PHP tutorial

In PHP, if we want to add or subtract time and date, we can use two functions, mktime and strtotime functions. Let me introduce to you how to use them. ​

mktime function

The mktime() function returns the Unix timestamp of a date.

The argument always represents a GMT date, so is_dst has no effect on the result.

The parameters can be left empty in order from right to left, and the empty parameters will be set to the corresponding current GMT value.

Parameter Description
hour optional. Specified hours.
minute is optional. Specified minutes.
second is optional. Specifies seconds.
month is optional. Specifies the numeric month.
day is optional. Specify days.
year is optional. Specified year. On some systems, legal values ​​are between 1901 - 2038. However, this limitation no longer exists in PHP 5.
is_dst Optional. Set to 1 if the time is during Daylight Saving Time (DST), 0 otherwise, or -1 if unknown.

Example

The mktime() function is very useful for date operations and verification. It can automatically correct out-of-bounds input:

The code is as follows

Copy code

代码如下	复制代码
echo(date("M-d-Y",mktime(0,0,0,12,36,2001))); echo(date("M-d-Y",mktime(0,0,0,14,1,2001))); echo(date("M-d-Y",mktime(0,0,0,1,1,2001))); echo(date("M-d-Y",mktime(0,0,0,1,1,99))); ?> 输出： Jan-05-2002 Feb-01-2002 Jan-01-2001 Jan-01-1999 strtotime(time,now)

echo(date("M-d-Y",mktime(0,0,0,12,36,2001)));

echo(date("M-d-Y",mktime(0,0,0,14,1,2001)));
echo(date("M-d-Y",mktime(0,0,0,1,1,2001)));
echo(date("M-d-Y",mktime(0,0,0,1,1,99)));

?>

代码如下	复制代码
function getTheMonday($date) {  if (date ( 'N', strtotime ( $date ) ) == 1) {   return date ( 'Y-m-d', strtotime ( 'Monday', strtotime ( $date ) ) );  } else {   return date ( 'Y-m-d', strtotime ( 'last Monday', strtotime ( $date ) ) );  } }

Output:

代码如下	复制代码
function getTheSunday($date) {  return date ( 'Y-m-d', strtotime ( 'Sunday', strtotime ( $date ) ) );   }

Jan-05-2002
Feb-01-2002 Jan-01-2001

Jan-01-1999

strtotime(time,now)

In a small project, we need to compare the month-on-month data. The span of the data is one week. To achieve time positioning, we wrote two functions. Welcome to help. Calculate Monday's date:

The code is as follows	Copy code
function getTheMonday($date) { if (date ( 'N', strtotime ( $date ) ) == 1) { Return date ( 'Y-m-d', strtotime ( 'Monday', strtotime ( $date ) ) ); } else { Return date ( 'Y-m-d', strtotime ( 'last Monday', strtotime ( $date ) ) ); } }

Calculate Sunday’s date:

The code is as follows	Copy code
function getTheSunday($date) { return date ( 'Y-m-d', strtotime ( 'Sunday', strtotime ( $date ) ) ); }

http://www.bkjia.com/PHPjc/445608.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445608.htmlTechArticleIn php, we need to add and subtract time and date. We can use two functions, mktime and strtotime functions, as follows Let me introduce to you how to use them. mktime function mktime() function...