3.6 时间加减

package main

import (
    "fmt"
    "time"
)

func main() {

    l, err := time.LoadLocation("Asia/Shanghai")
    if err != nil {
        panic(err)
    }
    t := time.Date(2017, 11, 30, 11, 10, 20, 0, l)
    fmt.Printf("Default date is: %v\n", t)

    // Add 3 days
    r1 := t.Add(72 * time.Hour)
    fmt.Printf("Default date +3HRS is: %v\n", r1)

    // Subtract 3 days
    r1 = t.Add(-72 * time.Hour)
    fmt.Printf("Default date -3HRS is: %v\n", r1)

    // More comfortable api
    // to add days/months/years
    r1 = t.AddDate(1, 3, 2)
    fmt.Printf("Default date +1YR +3MTH +2D is: %v\n", r1)
}

/*
Default date is: 2017-11-30 11:10:20 +0800 CST
Default date +3HRS is: 2017-12-03 11:10:20 +0800 CST
Default date -3HRS is: 2017-11-27 11:10:20 +0800 CST
Default date +1YR +3MTH +2D is: 2019-03-04 11:10:20 +0800 CST

*/