golang 小知识

01时间转换

func main() {
    layout := "2006-01-02 15:04:05"
    t := time.Now() // 获取当前时间 time.Time
    t_str := t.Format(layout) // 格式化当前时间 string
    t_stamp := t.Unix() // 时间戳 int64
    fmt.Printf("t: %v\n", t)
    fmt.Printf("t_str: %v\n", t_str)
    fmt.Printf("t_stamp: %v\n", t_stamp)

    // 时间戳转string转time.Time
    ts := time.Unix(t_stamp, 0).Format("2006-01-02 03:04:05 PM") // string
    tt, _ := time.Parse("2006-01-02 03:04:05 PM", ts) // time.Time
    fmt.Printf("ts: %v\n", ts)
    fmt.Printf("tt: %v\n", tt)

}

输出

t: 2019-04-22 19:31:01.949907 +0800 CST m=+0.000192687
t_str: 2019-04-22 19:31:01
t_stamp: 1555932661
ts: 2019-04-22 07:31:01 PM
tt: 2019-04-22 19:31:01 +0000 UTC

02字符串和数字转换

func main() {
    str := "123"
    it := 456

    // string转int
    _, err := strconv.Atoi(str)
    
    // string转int64
    _, err = strconv.ParseInt(str, 10, 64)

    // int转string
    _ = strconv.Itoa(it)

    // int64转string
    _ = strconv.FormatInt(int64(it), 10)
}