# Functions
DateRangeValidation date range validator.
DatetimeValidation date yyyy-MM-dd H:i:s format.
DateValidation date yyyy-MM-dd format.
RequiredIf if another field equal ? Example usage
type Foo struct {
A int `validate:"required"`
B int `validate:"rfe=A:1"`
}
*/.
RequiredIfNotEqual if another field not equal ?.