php基础

Question

php

Answer 1

<?php
date_default_timezone_set('Asia/Shanghai');$timestamp =  strtotime('2014 + 10 week -20 week');
echo  '2014年第10周减20周的结果是：'.date('Y年W周',$timestamp);
echo  '，timestamp是'.$timestamp;
?>

Answer 2

date_default_timezone_set('Asia/Shanghai');
$day = "201405";function getDay($day,$pre){
$year = substr($day, 0,4);
$week = substr($day, 4,2);
$curYear = $year."-01-01";
$xcDays = ($week + $pre)*7;//*7相差多少天 相差周数乘以7
echo date('Y-m-d',strtotime("$curYear $xcDays day")).'<br>';//
}
getDay($day,'-6');