javascript:
a. 代码:

var strtime = '2018-01-01 00:00:00';var date = new Date(strtime);var time = date.getTime().toString();time = time.slice(0,10)console.log(time)

b. 输出:

1514736000php:
a. 代码:

$time = strtotime("2018-01-01 00:00:00");echo $time;

b. 输出:

1514736000