fix: accept leap seconds in isoTimestamp validation

Author: bug3

src/schema.ts

@@ -27,7 +27,7 @@ function isValidDate(year: number, month: number, day: number): boolean {
 function isValidTime(hours: number, minutes: number, seconds: number): boolean {
     return hours >= 0 && hours <= 23
         && minutes >= 0 && minutes <= 59
-        && seconds >= 0 && seconds <= 59;
+        && seconds >= 0 && seconds <= 60;
 }
 
 export const schema = {

tests/schema.test.ts

@@ -111,7 +111,11 @@ describe('schema.isoTimestamp', () => {
         expect(schema.isoTimestamp.validate('2024-02-30T12:00:00Z')).toBe(false);
         expect(schema.isoTimestamp.validate('2024-01-01T25:00:00Z')).toBe(false);
         expect(schema.isoTimestamp.validate('2024-01-01T12:60:00Z')).toBe(false);
-        expect(schema.isoTimestamp.validate('2024-01-01T12:00:60Z')).toBe(false);
+        expect(schema.isoTimestamp.validate('2024-01-01T12:00:61Z')).toBe(false);
+    });
+
+    it('accepts leap second (seconds = 60)', () => {
+        expect(schema.isoTimestamp.validate('2016-12-31T23:59:60Z')).toBe(true);
     });
 });