在python 里有个函数datetime.timedelta 很有用，用来计算某个时间往后多少时间后的时间。
有点拗口，看看python 示例：
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#!/usr/bin/env python
# -*- coding:utf-8 -*-
from datetime import datetime,timedelta
now = datetime.now()
yestoday = now - timedelta(days=1)
tommorow = now + timedelta(days=1)
next_year = now + timedelta(days = 365)
golang 实现起来就不那么简洁了：
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package main
import (
"fmt"
"time"
)
func main() {
baseTime := time.Date(2015, 10, 25, 0, 0, 0, 0, time.UTC)
// after 2 days 8 hour 100 second
date := baseTime.Add(2*24*time.Hour + 8*time.Hour + 100*time.Second)
fmt.Println(date)
}