如何提取Unix时间戳并获取日期

I have an integer

x := 1468540800

I want to fetch the date out of this unix timestamp in Golang. I have tried time.ParseDuration but looks like that's not the correct way to extract date out of this. Converstion should happen like this http://www.unixtimestamp.com/index.php
I intend to convert into in ISO 8601 format may be. I want string like 2016-09-14.