1 files changed, 46 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/temporal/instant-to-json.js b/deps/v8/test/mjsunit/temporal/instant-to-json.js
new file mode 100644
index 0000000000..dbd5205883
--- /dev/null
+++ b/deps/v8/test/mjsunit/temporal/instant-to-json.js
@@ -0,0 +1,46 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Flags: --harmony-temporal
+
+
+assertEquals("1970-01-01T00:00:00Z",
+    (Temporal.Instant.fromEpochSeconds(0n)).toJSON());
+
+let days_in_sec = 24n * 60n * 60n;
+assertEquals("1970-12-31T23:59:59Z",
+    Temporal.Instant.fromEpochSeconds((365n * days_in_sec) - 1n).toJSON());
+assertEquals("1971-01-01T00:00:00Z",
+    Temporal.Instant.fromEpochSeconds((365n * days_in_sec)).toJSON());
+
+assertEquals("1971-12-31T23:59:59Z",
+    Temporal.Instant.fromEpochSeconds((2n *365n * days_in_sec - 1n)).toJSON());
+assertEquals("1972-01-01T00:00:00Z",
+    Temporal.Instant.fromEpochSeconds((2n *365n * days_in_sec)).toJSON());
+
+// 1972 is a leap year
+assertEquals("1972-02-28T00:00:00Z",
+    Temporal.Instant.fromEpochSeconds(((2n *365n + 58n) * days_in_sec)).toJSON());
+assertEquals("1972-02-29T00:00:00Z",
+    Temporal.Instant.fromEpochSeconds(((2n *365n + 59n) * days_in_sec)).toJSON());
+
+assertEquals("1985-01-01T00:00:00Z",
+    Temporal.Instant.fromEpochSeconds(((15n *365n + 4n) * days_in_sec)).toJSON());
+
+// Test with Date
+
+const year_in_sec = 24*60*60*365;
+const number_of_random_test = 500;
+for (i = 0; i < number_of_random_test ; i++) {
+  // bertween -5000 years and +5000 years
+  let ms = Math.floor(Math.random() * year_in_sec * 1000 * 10000) - year_in_sec * 1000 * 5000;
+  // Temporal auto precision will remove trailing zeros in milliseconds so we only
+  // compare the first 19 char- to second.
+  let d = new Date(ms)
+  let bigd = BigInt(d)
+  dateout = d.toJSON().substr(0,19);
+  temporalout = Temporal.Instant.fromEpochMilliseconds(bigd).toJSON().substr(0, 19);
+  if (dateout[0] != '0') {
+    assertEquals(dateout, temporalout, ms);
+  }
+}