时间计算

#获取给定日期 echo $date = "20111102"; echo "<br>"; $dateTime = strtotime($date); //前一天日期： echo $t = date("Ymd", strtotime("-1 day", $dateTime)); echo "<br>"; //所在周的周一日期： $weekStr = (date("N", $dateTime) == 1)? "monday": "-1 monday"; echo $t = date("Ymd", strtotime($weekStr, $dateTime)); echo "<br>"; //所在月的第一天日期： echo $t = date("Ym01", $dateTime); echo "<br>"; //所在月的最后一天日期： echo $t = date("Ymt", $dateTime); echo "<br>";