Merge pull request #498 from shintarou37/master

feat IsYYYYMMDD function

README.md

@@ -208,6 +208,7 @@ func IsULID(str string) bool
 func IsUnixTime(str string) bool
 func IsUpperCase(str string) bool
 func IsVariableWidth(str string) bool
+func IsYYYYMMDD(str string) bool
 func IsWhole(value float64) bool
 func LeftTrim(str, chars string) string
 func Map(array []interface{}, iterator ResultIterator) []interface{}
@@ -385,6 +386,7 @@ Here is a list of available validators for struct fields (validator - used funct
 "ISO3166Alpha2":      IsISO3166Alpha2,
 "ISO3166Alpha3":      IsISO3166Alpha3,
 "ulid":               IsULID,
+"yyyymmdd":           IsYYYYMMDD,
 ```
 Validators with parameters
 

types.go

@@ -166,6 +166,7 @@ var TagMap = map[string]Validator{
 	"ISO4217":            IsISO4217,
 	"IMEI":               IsIMEI,
 	"ulid":               IsULID,
+	"yyyymmdd":           IsYYYYMMDD,
 }
 
 // ISO3166Entry stores country codes

validator.go

@@ -454,26 +454,26 @@ func IsCreditCard(str string) bool {
 	if !rxCreditCard.MatchString(sanitized) {
 		return false
 	}
-	
+
 	number, _ := ToInt(sanitized)
-	number, lastDigit := number / 10, number % 10	
+	number, lastDigit := number/10, number%10
 
 	var sum int64
-	for i:=0; number > 0; i++ {
+	for i := 0; number > 0; i++ {
 		digit := number % 10
-		
-		if i % 2 == 0 {
+
+		if i%2 == 0 {
 			digit *= 2
 			if digit > 9 {
 				digit -= 9
 			}
 		}
-		
+
 		sum += digit
 		number = number / 10
 	}
-	
-	return (sum + lastDigit) % 10 == 0
+
+	return (sum+lastDigit)%10 == 0
 }
 
 // IsISBN10 checks if the string is an ISBN version 10.
@@ -1766,3 +1766,10 @@ func (sv stringValues) get(i int) string   { return sv[i].String() }
 func IsE164(str string) bool {
 	return rxE164.MatchString(str)
 }
+
+// IsYYYYMMDD checks if a string is in the "YYYY-MM-DD" date format and returns true if valid.
+func IsYYYYMMDD(str string) bool {
+	layout := "2006-01-02"
+	_, err := time.Parse(layout, str)
+	return err == nil
+}

validator_test.go

@@ -3865,3 +3865,23 @@ func TestIsE164(t *testing.T) {
 		}
 	}
 }
+
+func TestIsYYYYMMDD(t *testing.T) {
+	t.Parallel()
+
+	var tests = []struct {
+		param    string
+		expected bool
+	}{
+		{"2000-01-01", true},
+		{"2000-13-01", false},
+		{"20000-01-01", false},
+		{"2000-01-32", false},
+	}
+	for _, test := range tests {
+		actual := IsYYYYMMDD(test.param)
+		if actual != test.expected {
+			t.Errorf("Expected IsYYYYMMDD(%q) to be %v, got %v", test.param, test.expected, actual)
+		}
+	}
+}