Use xml schema datetime validator.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 - **BREAKING**: Default issuance now uses VC 2.0 context.
+- **BREAKING**: DateTime validator is now an xml schema DateTime validator.
 - Support for VC 2.0 credentials issuance and verification.
 - Support for VC 2.0 `validUntil` and `validFrom`.
 - Support for VP 2.0 presentations issuance and verification.

lib/helpers.js

@@ -10,13 +10,15 @@ export const {
     CONTEXT_URL: CREDENTIALS_CONTEXT_V2_URL
   }
 } = credentialsContextV2;
-// Z and T can be lowercase
-// RFC3339 regex
-export const dateRegex = new RegExp('^(\\d{4})-(0[1-9]|1[0-2])-' +
-    '(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):' +
-    '([0-5][0-9]):([0-5][0-9]|60)' +
-    '(\\.[0-9]+)?(Z|(\\+|-)([01][0-9]|2[0-3]):' +
-    '([0-5][0-9]))$', 'i');
+// Z and T must be uppercase
+// xml schema date time RegExp
+// @see https://www.w3.org/TR/xmlschema11-2/#dateTime
+export const dateRegex = new RegExp(
+  '-?([1-9][0-9]{3,}|0[0-9]{3})' +
+  '-(0[1-9]|1[0-2])' +
+  '-(0[1-9]|[12][0-9]|3[01])' +
+  'T(([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](\.[0-9]+)?|(24:00:00(\.0+)?))' +
+  '(Z|(\\+|-)((0[0-9]|1[0-3]):[0-5][0-9]|14:00))?');
 
 // entries should be in ascending version order
 // so v1 is entry 0

test/20-dateRegex.spec.js

@@ -6,22 +6,23 @@ chai.should();
 
 import * as vc from '../lib/index.js';
 
+const assertDateTime = (date, bool) =>
+  vc.dateRegex.test(date).should.equal(bool);
+
 describe('verifies RFC3339 Dates', function() {
   it('verify a valid date', function() {
     const latest = new Date().toISOString();
-    vc.dateRegex.test(latest).should.be.true;
+    assertDateTime(latest, true);
   });
-  it('verify a valid date with lowercase t', function() {
+  it('does not verify a valid date with lowercase t', function() {
     const latest = new Date().toISOString().toLowerCase();
-    vc.dateRegex.test(latest).should.be.true;
+    assertDateTime(latest, false);
   });
 
   it('should not verify an invalid date', function() {
-    const invalid = '2017/09/27';
-    vc.dateRegex.test(invalid).should.be.false;
+    assertDateTime('2017/09/27', false);
   });
   it('should not verify 2 digit years', function() {
-    const invalid = '17-09-27T22:07:22.563z';
-    vc.dateRegex.test(invalid).should.be.false;
+    assertDateTime('17-09-27T22:07:22.563Z', false);
   });
 });