1day before in golang

_1day_before.go

package main

import (
    "fmt"
    "time"
)

func main() {
    fmt.Println("Hello, 世界")
    n := time.Now()
    fmt.Printf("%v\n", n)
    d,err := time.ParseDuration("24h")
    fmt.Printf("%v\n", d)
    fmt.Printf("%v\n", err)
    before := n.Add(-d)
    fmt.Printf("%v\n", before)
    ts := before.Unix()
    fmt.Printf("%v\n", ts)
}