php时间计算相关问题小结，php相关问题小结_PHP教程

<&#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;>

$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

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

$date = "2008-12-08";
if (isCurrentWeeks($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")));
}