Ten or more digit precision should fail

Author: zachleat

parse.js

@@ -6,7 +6,7 @@ export class IsoDateParts {
 	};
 
 	static FULL_DATE_REGEX = /^([+-]\d{6}|\d{4})-?([01]\d)-?([0-3]\d)$/;
-	static DATETIME_REGEX = /^([+-]\d{6}|\d{4})-?([01]\d)-?([0-3]\d)[Tt ]([0-2]\d(?:[\.\,]\d+)?)(?::?([0-5]\d(?:[\.\,]\d+)?)(?::?([0-5]\d))?(?:[\.\,](\d+))?)?(Z|[+-][0-2]\d(?::?[0-5]\d)?)?$/;
+	static DATETIME_REGEX = /^([+-]\d{6}|\d{4})-?([01]\d)-?([0-3]\d)[Tt ]([0-2]\d(?:[\.\,]\d+)?)(?::?([0-5]\d(?:[\.\,]\d+)?)(?::?([0-5]\d))?(?:[\.\,](\d{1,9}))?)?(Z|[+-][0-2]\d(?::?[0-5]\d)?)?$/;
 	static TIMEZONE_REGEX = /^([+-]\d{2})(?::?(\d{2}))?$/;
 	static IS_FRACTIONAL_REGEX = /^\d+[\.\,]\d+$/;
 

test/utils.js

@@ -141,6 +141,10 @@ export const INVALID_TEST_CASES = `
 09:24:15
 09:24:15.123
 09:24:15,123
+
+// Ten digit precision not supported (RFC 9557)
+20250721T152640.3965097519
+20250721T152640,3965097519
 `
 
 // Some Date/DateTime tests cribbed from https://ijmacd.github.io/rfc3339-iso8601/