1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Date/prototype/toString/negative-year.js b/js/src/tests/test262/built-ins/Date/prototype/toString/negative-year.js
new file mode 100644
index 0000000000..b1cd8d2d2c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Date/prototype/toString/negative-year.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2018 Richard Gibson. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: >
+    Negative years must be serialized with at least four digits
+esid: sec-date.prototype.tostring
+info: |
+    Date.prototype.toString ( )
+
+    2. Return ToDateString(_tv_).
+---*/
+
+var negative1DigitYearToString = (new Date('-000001-07-01T00:00Z')).toString();
+var negative2DigitYearToString = (new Date('-000012-07-01T00:00Z')).toString();
+var negative3DigitYearToString = (new Date('-000123-07-01T00:00Z')).toString();
+var negative4DigitYearToString = (new Date('-001234-07-01T00:00Z')).toString();
+var negative5DigitYearToString = (new Date('-012345-07-01T00:00Z')).toString();
+var negative6DigitYearToString = (new Date('-123456-07-01T00:00Z')).toString();
+
+// Date.prototype.toString emits values like
+// "Fri Mar 28 2019 10:23:42 GMT-0400 (Eastern Daylight Time)".
+// Extract and verify just the year.
+assert.sameValue(negative1DigitYearToString.split(' ')[3], '-0001',
+    'Date.prototype.toString serializes year -1 to "-0001"');
+assert.sameValue(negative2DigitYearToString.split(' ')[3], '-0012',
+    'Date.prototype.toString serializes year -12 to "-0012"');
+assert.sameValue(negative3DigitYearToString.split(' ')[3], '-0123',
+    'Date.prototype.toString serializes year -123 to "-0123"');
+assert.sameValue(negative4DigitYearToString.split(' ')[3], '-1234',
+    'Date.prototype.toString serializes year -1234 to "-1234"');
+assert.sameValue(negative5DigitYearToString.split(' ')[3], '-12345',
+    'Date.prototype.toString serializes year -12345 to "-12345"');
+assert.sameValue(negative6DigitYearToString.split(' ')[3], '-123456',
+    'Date.prototype.toString serializes year -123456 to "-123456"');
+
+reportCompare(0, 0);