Summary of issues related to PHP time calculation PHP calculation execution time PHP one-day timestamp calculation PHP calculation remaining time

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

1. Get the date three months ago with php

<&#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. Calculate the date 30 days later

You can use strtotime PHP provides a super simple way to complete the original task Dozens of lines of code work.

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 timestamps 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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