"github.com/gin-gonic/gin"
"github.com/gin-gonic/gin/binding"
"github.com/go-playground/validator/v10"
"net/http"
"time"
type Booking struct {
// 包含绑定和验证的数据,bookabledate就是自定义的验证函数
CheckIn time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
// gtfield=CheckIn只对数字或时间有效，参考官网链接
// https://pkg.go.dev/github.com/go-playground/validator/v10#section-readme
CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn,bookabledate" time_format:"2006-01-02"`
// 自定义验证器
var bookableDate validator.Func = func(fl validator.FieldLevel) bool {
if date, ok := fl.Field().Interface().(time.Time); ok {
today := time.Now()
if today.After(date) { // 输入的日期必须大于今天的日期，否则验证失败
return false
return true
func main() {
router := gin.Default()
// 注册验证器
validate, ok := binding.Validator.Engine().(*validator.Validate)
if ok {
validate.RegisterValidation("bookabledate", bookableDate)
router.GET("/bookable", getBookable)
router.Run()
func getBookable(context *gin.Context) {
var book Booking
if err := context.ShouldBindWith(&book, binding.Query); err == nil {
context.JSON(200, gin.H{"message": "book date is valid"})
} else {
context.JSON(http.StatusBadRequest, gin.H{"err": err.Error()})
