PHP Time Calculation related issues summary _php skills

This article summarizes the problems related to PHP time calculation. Share to everyone for your reference, specific as follows:

1. PHP get three months ago date

<?php header ("content-type:text/html; Charset=utf-8 ");? >
<?php
$s _sdate=date ("y-m-d");//Current time
$moth _day=90;//month (convert to days)
$s _edate=date ("y-m-d", Strtotime ($s _sdate)-$moth _day*84600));
echo $moth _day. " The date before is ". $s _edate;
? >

2.30 days after the date of calculation

You can use strtotime PHP to provide a super simple way to do what would have been dozens of lines of code.

First convert a date to a Unix timestamp

$t = time (); Current timestamp
$t = strtotime ("+30 days", $t);//30 day timestamp
echo date ("y-m-d", $t);//Format Date

3. Convert time stamp for 2nd period ... and subtract.

$t 1 = strtotime ("2009-08-19");
$t 2 = strtotime ("2009-08-20");
$t = $t 2-$t 1; Second
echo (int) ($t/86400) in Days of difference

4. Determine if this is the week

$date = "2008-12-08";
if (Iscurrentweeks ($date)) {
  echo $date. " Is this week ";
} else {
  echo $date. " Not this week ";
}
function Iscurrentweeks ($d) {return
  (date ("W", Strtotime ($d)) ==date ("W", Strtotime ("Now"));
}

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I hope this article will help you with the PHP program design.