Fixed time regex and validation to be up to spec

Author: xBlaz3kx

builder_test.go

@@ -45,7 +45,7 @@ func (s *builderTestSuite) TestBuilder_Valid() {
 		WithIdentificationStatus(true).
 		WithIdentificationType(string(RfidNone)).
 		AddReading(Reading{
-			Time:         "2018-07-24T13:22:04,000+0200",
+			Time:         "2018-07-24T13:22:04,000+0200 S",
 			ReadingValue: 123,
 			ReadingUnit:  string(UnitskWh),
 			Status:       string(MeterOk),
@@ -56,7 +56,7 @@ func (s *builderTestSuite) TestBuilder_Valid() {
 	s.Equal(true, builder.payload.IdentificationStatus)
 	s.Equal(string(RfidNone), builder.payload.IdentificationType)
 	s.Len(builder.payload.Readings, 1)
-	s.Equal("2018-07-24T13:22:04,000+0200", builder.payload.Readings[0].Time)
+	s.Equal("2018-07-24T13:22:04,000+0200 S", builder.payload.Readings[0].Time)
 	s.Equal(float64(123), builder.payload.Readings[0].ReadingValue)
 	s.Equal(string(UnitskWh), builder.payload.Readings[0].ReadingUnit)
 	s.Equal(string(MeterOk), builder.payload.Readings[0].Status)

validation.go

@@ -71,7 +71,7 @@ func currentTypeValidator(fl validator.FieldLevel) bool {
 	return isValidCurrentType(CurrentType(fl.Field().String()))
 }
 
-var iso8601WithMillisRegex = regexp.MustCompile(`^(?:19|20)\d{2}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])T(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:Z|-0[1-9]|-1\d|-2[0-3]|-00:?(?:0[1-9]|[1-5]\d)|\+[01]\d|\+2[0-3])(?:|:?[0-5]\d)$`)
+var iso8601WithMillisRegex = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2},\d{3}[+-]\d{4} [S|U|I|R]$`)
 
 func iso8601WithMillisValidator(fl validator.FieldLevel) bool {
 	return iso8601WithMillisRegex.MatchString(fl.Field().String())