PHP Date ( I need to use)

$date = "2016-03-09";$timestamp = strtotime($date);  // 1457481600

var timestamp = Date.UTC(2016, 2, 9) / 1000; // 1457481600

var date = new Date(2016, 2, 9);var timestamp = +date / 1000; // 1457452800

$timestamp = 1457481600;$date = date("Y-m-d", $timestamp);  // 2016-03-09

// 获取当前时间$today = date("Y-m-d");  // 2016-03-09// 获取昨天时间$yesterday = date("Y-m-d", strtotime('-1 days')); // 2016-03-08

date_default_timezone_set("Asia/Shanghai");$time = date("Y-m-d H:i:s"); // 东八区当地时间