LibJS: Restore some Temporal numeric constants

And add few ad-hoc constants for convenience.

Libraries/LibJS/CMakeLists.txt

@@ -206,6 +206,7 @@ set(SOURCES
     Runtime/SymbolPrototype.cpp
     Runtime/Temporal/AbstractOperations.cpp
     Runtime/Temporal/Duration.cpp
+    Runtime/Temporal/Instant.cpp
     Runtime/Temporal/Temporal.cpp
     Runtime/TypedArray.cpp
     Runtime/TypedArrayConstructor.cpp

Libraries/LibJS/Runtime/Temporal/Instant.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
+ * Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
+ * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Temporal/Instant.h>
+
+namespace JS::Temporal {
+
+// nsMaxInstant = 10**8 × nsPerDay = 8.64 × 10**21
+Crypto::SignedBigInteger const NANOSECONDS_MAX_INSTANT = "8640000000000000000000"_sbigint;
+
+// nsMinInstant = -nsMaxInstant = -8.64 × 10**21
+Crypto::SignedBigInteger const NANOSECONDS_MIN_INSTANT = "-8640000000000000000000"_sbigint;
+
+// nsPerDay = 10**6 × ℝ(msPerDay) = 8.64 × 10**13
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_DAY = 86400000000000_bigint;
+
+// Non-standard:
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_HOUR = 3600000000000_bigint;
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_MINUTE = 60000000000_bigint;
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_SECOND = 1000000000_bigint;
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_MILLISECOND = 1000000_bigint;
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_MICROSECOND = 1000_bigint;
+Crypto::UnsignedBigInteger const NANOSECONDS_PER_NANOSECOND = 1_bigint;
+
+Crypto::UnsignedBigInteger const MICROSECONDS_PER_MILLISECOND = 1000_bigint;
+Crypto::UnsignedBigInteger const MILLISECONDS_PER_SECOND = 1000_bigint;
+Crypto::UnsignedBigInteger const SECONDS_PER_MINUTE = 60_bigint;
+Crypto::UnsignedBigInteger const MINUTES_PER_HOUR = 60_bigint;
+Crypto::UnsignedBigInteger const HOURS_PER_DAY = 24_bigint;
+
+}

Libraries/LibJS/Runtime/Temporal/Instant.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
+ * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibCrypto/BigInt/SignedBigInteger.h>
+#include <LibCrypto/BigInt/UnsignedBigInteger.h>
+
+namespace JS::Temporal {
+
+// https://tc39.es/proposal-temporal/#eqn-nsMaxInstant
+extern Crypto::SignedBigInteger const NANOSECONDS_MAX_INSTANT;
+
+// https://tc39.es/proposal-temporal/#eqn-nsMinInstant
+extern Crypto::SignedBigInteger const NANOSECONDS_MIN_INSTANT;
+
+// https://tc39.es/proposal-temporal/#eqn-nsPerDay
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_DAY;
+
+// Non-standard:
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_HOUR;
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_MINUTE;
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_SECOND;
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_MILLISECOND;
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_MICROSECOND;
+extern Crypto::UnsignedBigInteger const NANOSECONDS_PER_NANOSECOND;
+
+extern Crypto::UnsignedBigInteger const MICROSECONDS_PER_MILLISECOND;
+extern Crypto::UnsignedBigInteger const MILLISECONDS_PER_SECOND;
+extern Crypto::UnsignedBigInteger const SECONDS_PER_MINUTE;
+extern Crypto::UnsignedBigInteger const MINUTES_PER_HOUR;
+extern Crypto::UnsignedBigInteger const HOURS_PER_DAY;
+
+}