php时间格式化date怎么用？

<?php
echo date("Y-m-d H:i:s", time());
?>

date时间大全

<?php
echo "今天:".date("Y-m-d")."<br>";
echo "昨天:".date("Y-m-d", strtotime("-1 day")), "<br>";
echo "明天:".date("Y-m-d", strtotime("+1 day")). "<br>";

echo "一周后:".date("Y-m-d", strtotime("+1 week")). "<br>";
echo "一周零两天四小时两秒后:".date("Y-m-d G:H:s", strtotime("+1 week 2 days 4 hours 2 seconds")). "<br>";
echo "下个星期四:".date("Y-m-d", strtotime("next Thursday")). "<br>";
echo "上个周一:".date("Y-m-d", strtotime("last Monday"))."<br>";
echo "一个月前:".date("Y-m-d", strtotime("last month"))."<br>";
echo "一个月后:".date("Y-m-d", strtotime("+1 month"))."<br>";
echo "十年后:".date("Y-m-d", strtotime("+10 year"))."<br>";

#昨天
echo date("Y/m/d h:i:s", time()-24*60*60);
echo "<br>";
#前天
echo date("Y/m/d h:i:s", time()-2*24*60*60);

date("Y/m/d H:i:s", strtotime("1 days ago"));
date("Y/m/d H:i:s", strtotime("2 days ago"));
date("Y/m/d H:i:s", mktime(0, 0, 0, date("m"), date("d")-1, date("Y")));


$time_yes = localtime(time()-24*60*60, true);
$time_b_yes = localtime(time()-2*24*60*60, true);
$yesterday = $time_yes['tm_mday'];
$the_day_before_yes = $time_b_yes['tm_mday'];


//昨天
print date('Y-m-d', strtotime('-1 day'));
//上星期
print date('Y-m-d', strtotime('-1 week'));
//上个月
print date('Y-m-d', strtotime('-1 month'));
//去年
print date('Y-m-d', strtotime('-1 year'));


//strtotime得到一个时间戳, 然后你自己格式化.
strtotime('yesterday');
strtotime('-2 day');