string - 将 time.Time 转换为字符串

Question

我正在尝试将一些值从我的数据库添加到 Go 中的 []string。其中一些是时间戳。

我得到错误:

cannot use U.Created_date (type time.Time) as type string in array element

我可以将 time.Time 转换为 string 吗？

type UsersSession struct {
    Userid int
    Timestamp time.Time
    Created_date time.Time
}

type Users struct {
    Name string
    Email string
    Country string
    Created_date time.Time
    Id int
    Hash string
    IP string
}

-

var usersArray = [][]string{}

rows, err := db.Query("SELECT u.id, u.hash, u.name, u.email, u.country, u.IP, u.created_date, us.timestamp, us.created_date FROM usersSession AS us LEFT JOIN users AS u ON u.id = us.userid WHERE us.timestamp + interval 30 minute >= now()")

U := Users{}
US := UsersSession{}

for rows.Next() {
    err = rows.Scan(&U.Id, &U.Hash, &U.Name, &U.Email, &U.Country, &U.IP, &U.Created_date, &US.Timestamp, &US.Created_date)
    checkErr(err)

    userid_string := strconv.Itoa(U.Id)
    user := []string{userid_string, U.Hash, U.Name, U.Email, U.Country, U.IP, U.Created_date, US.Timestamp, US.Created_date}
    // -------------
    // ^ this is where the error occurs
    // cannot use U.Created_date (type time.Time) as type string in array element (for US.Created_date and US.Timestamp aswell)
    // -------------

    usersArray = append(usersArray, user)
    log.Print("usersArray: ", usersArray)
}

编辑

我添加了以下内容。现在可以用了，谢谢。

userCreatedDate := U.Created_date.Format("2006-01-02 15:04:05")
userSessionCreatedDate := US.Created_date.Format("2006-01-02 15:04:05")
userSessionTimestamp := US.Timestamp.Format("2006-01-02 15:04:05")

Answer 1

您可以使用 Time.String()转换 time.Time 的方法到 string。这使用格式字符串 "2006-01-02 15:04:05.999999999 -0700 MST"。

如果需要其他自定义格式，可以使用Time.Format() .例如，要获取格式为 yyyy-MM-dd HH:mm:ss 的时间戳，请使用格式字符串 "2006-01-02 15:04:05" .

例子:

t := time.Now()
fmt.Println(t.String())
fmt.Println(t.Format("2006-01-02 15:04:05"))

输出(在 Go Playground 上尝试):

2009-11-10 23:00:00 +0000 UTC
2009-11-10 23:00:00

注意:Go Playground 上的时间始终设置为上面显示的值。在本地运行它以查看当前日期/时间。

另请注意，使用 Time.Format()，作为布局 string，您始终必须传递相同的时间——称为 reference时间——以您希望结果格式化的方式格式化。这记录在 Time.Format() 中:

Format returns a textual representation of the time value formatted according to layout, which defines the format by showing how the reference time, defined to be

Mon Jan 2 15:04:05 -0700 MST 2006

would be displayed if it were the value; it serves as an example of the desired output. The same display rules will then be applied to the time value.