Add support for RFC9557 6-digit years preceded by + or -

Author: zachleat

parse.js

@@ -5,8 +5,8 @@ export class IsoDateParts {
 		minutes: 0,
 	};
 
-	static FULL_DATE_REGEX = /^(\d{4})-?([01]\d)-?([0-3]\d)$/;
-	static DATETIME_REGEX = /^(\d{4})-?([01]\d)-?([0-3]\d)T([0-2]\d(?:[\.\,]\d+)?)(?::?([0-5]\d(?:[\.\,]\d+)?)(?::?([0-5]\d))?(?:[\.\,](\d+))?)?(Z|[+-][0-2]\d(?::?[0-5]\d)?)?$/;
+	static FULL_DATE_REGEX = /^([+-]\d{6}|\d{4})-?([01]\d)-?([0-3]\d)$/;
+	static DATETIME_REGEX = /^([+-]\d{6}|\d{4})-?([01]\d)-?([0-3]\d)T([0-2]\d(?:[\.\,]\d+)?)(?::?([0-5]\d(?:[\.\,]\d+)?)(?::?([0-5]\d))?(?:[\.\,](\d+))?)?(Z|[+-][0-2]\d(?::?[0-5]\d)?)?$/;
 	static TIMEZONE_REGEX = /^([+-]\d{2})(?::?(\d{2}))?$/;
 	static IS_FRACTIONAL_REGEX = /^\d+[\.\,]\d+$/;
 

test/utils.js

@@ -75,6 +75,12 @@ export const VALID_TEST_CASES = `
 2016-05-25T09:24:15+0600
 2016-05-25T09:24:15-06
 2016-05-25T09:24:15-0600
+
+// 6 digit years
++002000-01-01
+-002000-01-01
++0020000101
+-0020000101
 `
 
 // Expected to fail