Restore Instant and Clock as type aliases to kotlin.time

Author: dkhalanskyjb

core/common/src/DeprecatedClock.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2019-2025 JetBrains s.r.o. and contributors.
+ * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
+ */
+
+package kotlinx.datetime
+
+/**
+ * This is a deprecated type alias for `kotlinx.datetime.Clock`.
+ *
+ * Before 0.7.0, this type was used to represent a clock in the `kotlinx.datetime` library.
+ * However, in Kotlin 2.1.20,
+ * the `kotlin.time.Clock` type was introduced and is now the preferred way to represent a clock.
+ *
+ * This type alias is kept for making sure the existing code that uses `kotlinx.datetime.Clock` compiles.
+ * For ensuring binary compatibility instead of source compatibility,
+ * see <https://github.com/Kotlin/kotlinx-datetime?tab=readme-ov-file#deprecation-of-instant>.
+ */
+@Deprecated(
+    "This type is deprecated in favor of `kotlin.time.Clock`.",
+    level = DeprecationLevel.WARNING,
+    replaceWith = ReplaceWith("kotlin.time.Clock", "kotlin.time.Clock"))
+public typealias Clock = kotlin.time.Clock

core/common/src/DeprecatedInstant.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2019-2025 JetBrains s.r.o. and contributors.
+ * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
+ */
+
+package kotlinx.datetime
+
+/**
+ * This is a deprecated type alias for `kotlinx.datetime.Instant`.
+ *
+ * Before 0.7.0, this type was used to represent a clock in the `kotlinx.datetime` library.
+ * However, in Kotlin 2.1.20,
+ * the `kotlin.time.Instant` type was introduced and is now the preferred way to represent a moment in time.
+ *
+ * This type alias is kept for making sure the existing code that uses `kotlinx.datetime.Instant` compiles.
+ * For ensuring binary compatibility instead of source compatibility,
+ * see <https://github.com/Kotlin/kotlinx-datetime?tab=readme-ov-file#deprecation-of-instant>.
+ */
+@Deprecated(
+    "This type is deprecated in favor of `kotlin.time.Instant`.",
+    level = DeprecationLevel.WARNING,
+    replaceWith = ReplaceWith("kotlin.time.Instant", "kotlin.time.Instant"))
+public typealias Instant = kotlin.time.Instant