英文:
How can i add two date forms with time.Parse?
问题
我正在尝试添加两种不同的日期格式以增加测试的灵活性，但是我遇到了以下错误：
当我尝试解析日期时收到的错误消息如下所示：
2021/10/21 12:15:35 parsing time "1982/01/08" as "2006-01-02": cannot parse "/01/08" as "-"
BD.go
package mainimport ("encoding/json""fmt""io/ioutil""log""os""time")// Users 结构体包含一个用户数组type Users struct {Users []User `json:"users"`}// User 结构体包含姓名、类型和社交链接列表type User struct {Firstname string `json:"fname"`Secondname string `json:"lname"`Date string `json:"date"`}func Birthday() {// 打开json文件jsonFile, err := os.Open("users.json")// 如果os.Open返回错误，则处理错误if err != nil {fmt.Println(err)}fmt.Println("成功打开users.json")// 延迟关闭json文件，以便稍后解析defer jsonFile.Close()// 将打开的json文件读取为字节数组byteValue, _ := ioutil.ReadAll(jsonFile)// 初始化Users数组var users Users// 将包含json文件内容的字节数组解组为上面定义的'users'json.Unmarshal(byteValue, &users)// 遍历users数组中的每个用户，并打印用户类型、姓名和Facebook链接作为示例// 编写一个函数列出今天过生日的人// var yr intfor i := 0; i < len(users.Users); i++ {date, err := time.Parse("2006/01/02", users.Users[i].Date)date1, _ := time.Parse("2006-01-02", users.Users[i].Date)if err != nil {fmt.Println(date)} else if err != nil {fmt.Println(date1)} else {log.Fatal(err)}// 检查日期是否是闰年，例如：29不是闰年，但28是！if date.Day()%400 == 0 || (date.Day()%4 == 0 && date.Day()%100 != 0) {fmt.Println("用户名：", users.Users[i].Firstname)fmt.Println("用户姓氏：", users.Users[i].Secondname)fmt.Println("用户日期：", users.Users[i].Date)fmt.Println(users.Users[i].Date, "是闰年 ✨✨✨")} else if date1.Day()%400 == 0 || (date1.Day()%4 == 0 && date1.Day()%100 != 0) {fmt.Println("用户名：", users.Users[i].Firstname)fmt.Println("用户姓氏：", users.Users[i].Secondname)fmt.Println("用户日期：", users.Users[i].Date)fmt.Println(users.Users[i].Date, "是闰年 ✨✨✨")} else {fmt.Println("用户名：", users.Users[i].Firstname)fmt.Println("用户姓氏：", users.Users[i].Secondname)fmt.Println("用户日期：", users.Users[i].Date)fmt.Println(users.Users[i].Date, "不是闰年 💥💥💥")}}}func main() {Birthday()}
.JSON 文件
{"users": [{"Fname": "Johnny","Lname":"mane","date":"1982/01/08"},{"Fname": "Wayne","Lname":"Bruce","date":"1965/01/30"},{"Fname": "Gaga","Lname":"Lady","date":"1986/03/28"},{"Fname": "radio","Lname":"head","date":"1988/02/29"},{"Fname": "Mario","Lname":"torres","date":"1996/09/28"},{"Fname": "robert","Lname":"Alex","date":"1991/12/01"},{"Fname": "Julia","Lname":"sevak","date":"1991-03-07"},{"Fname": "feb","Lname":"robert","date":"1995-01-31"}]}
英文:
I'm trying to add two different date forms for more flexibility during testing, but I got this error below:
The error I received when I tried to parse dates --> 2021/10/21 12:15:35 parsing time "1982/01/08" as "2006-01-02": cannot parse "/01/08" as "-"
BD.go
package mainimport ("encoding/json""fmt""io/ioutil""log""os""time")// Users struct which contains// an array of userstype Users struct {Users []User `json:"users"`}// User struct which contains a name// a type and a list of social linkstype User struct {Firstname string `json:"fname"`Secondname string `json:"lname"`Date string `json:"date"`}func Birthday() {// Open our jsonFilejsonFile, err := os.Open("users.json")// if we os.Open returns an error then handle itif err != nil {fmt.Println(err)}fmt.Println("Successfully Opened users.json")// defer the closing of our jsonFile so that we can parse it later ondefer jsonFile.Close()// read our opened xmlFile as a byte array.byteValue, _ := ioutil.ReadAll(jsonFile)// we initialize our Users arrayvar users Users// we unmarshal our byteArray which contains our// jsonFile's content into 'users' which we defined abovejson.Unmarshal(byteValue, &users)// we iterate through every user within our users array and// print out the user Type, their name, and their facebook url// as just an example// write a function to list out the people whose birthday is today.// var yr intfor i := 0; i < len(users.Users); i++ {date, err := time.Parse("2006/01/02", users.Users[i].Date)date1, _ := time.Parse("2006-01-02", users.Users[i].Date)if err != nil {fmt.Println(date)} else if err != nil {fmt.Println(date1)} else {log.Fatal(err)}// check if the date is a leap year, ex: 29 is not a leap year but 28th is !if date.Day()%400 == 0 || (date.Day()%4 == 0 && date.Day()%100 != 0) {fmt.Println("User First Name: " + users.Users[i].Firstname)fmt.Println("User Second Name: " + users.Users[i].Secondname)fmt.Println("User Date: " + users.Users[i].Date)fmt.Println(users.Users[i].Date, " is a Leap Year ✨✨✨ ")} else if date1.Day()%400 == 0 || (date1.Day()%4 == 0 && date1.Day()%100 != 0) {fmt.Println("User First Name: " + users.Users[i].Firstname)fmt.Println("User Second Name: " + users.Users[i].Secondname)fmt.Println("User Date: " + users.Users[i].Date)fmt.Println(users.Users[i].Date, " is a Leap Year ✨✨✨ ")} else {fmt.Println("User First Name: " + users.Users[i].Firstname)fmt.Println("User Second Name: " + users.Users[i].Secondname)fmt.Println("User Date: " + users.Users[i].Date)fmt.Println(users.Users[i].Date, " is Not a Leap Year 💥💥💥 ")}}}func main() {Birthday()}
.JSON file
{"users": [{"Fname": "Johnny","Lname":"mane","date":"1982/01/08"},{"Fname": "Wayne","Lname":"Bruce","date":"1965/01/30"},{"Fname": "Gaga","Lname":"Lady","date":"1986/03/28"},{"Fname": "radio","Lname":"head","date":"1988/02/29"},{"Fname": "Mario","Lname":"torres","date":"1996/09/28"},{"Fname": "robert","Lname":"Alex","date":"1991/12/01"},{"Fname": "Julia","Lname":"sevak","date":"1991-03-07" -->},{"Fname": "feb","Lname":"robert","date":"1995-01-31". --->}]}
答案1
得分: 3
你的错误处理似乎有问题。你需要在第一次尝试解析日期时检查错误。如果失败了，尝试使用不同的格式解析：
date, err := time.Parse("2006/01/02", users.Users[i].Date)if err != nil {// 第一次尝试失败，所以再试一次...date, err = time.Parse("2006-01-02", users.Users[i].Date)if err != nil {// 两次尝试都失败了}}// 一切正常
英文:
Your error handling seems wrong. You need to check for the error on the first attempt parsing the date. If it failed, try parsing with a different layout:
date, err := time.Parse("2006/01/02", users.Users[i].Date)if err != nil {// first attempt failed, so try again...date, err = time.Parse("2006-01-02", users.Users[i].Date)if err != nil {// both attempts failed}}// all ok
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