Summary of PHP time calculation related issues, summary of PHP related issues_PHP tutorial

A summary of PHP time calculation-related issues, A summary of PHP-related issues

The examples in this article summarize PHP time calculation-related issues. Share it with everyone for your reference, the details are as follows:

1. php to get the date three months ago

<&#63;php header("content-Type: text/html; charset=utf-8");&#63;>
<&#63;php
$s_sdate=date("Y-m-d"); //当前时间
$moth_day=90; //月份 (转为天数)
$s_edate=date("Y-m-d",(strtotime($s_sdate)-$moth_day*84600));
echo $moth_day."前的日期为".$s_edate;
&#63;>

2. Calculated 30 days after the date

You can use strtotime. PHP provides a super simple way to complete work that would otherwise require dozens of lines of code.

First convert a date into a UNIX timestamp

$t = time(); // 当前时间戳
$t = strtotime("+30 days", $t); // 30天后的时间戳
echo date("Y-m-d", $t); // 格式化日期

3. Convert the timestamp of 2 dates...and then subtract

$t1 = strtotime("2009-08-19");
$t2 = strtotime("2009-08-20");
$t = $t2 - $t1; // 相差天数的秒
echo (int)($t / 86400)

4. Determine whether it is this week

$date = "2008-12-08";
if (isCurrentWeeks($date)) {
  echo $date."是本星期";
} else {
  echo $date."不是本星期";
}
function isCurrentWeeks($d) {
  return (date("W",strtotime($d))==date("W",strtotime("now")));
}

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