src: deprecate V8 date conversion helpers

These helpers provide no benefit over the existing V8 API,
and at least one of them fetches the current `Isolate` through
`Isolate::GetCurrent()` (which should be avoided).

PR-URL: #23179
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node.h

@@ -309,9 +309,16 @@ NODE_EXTERN void RunAtExit(Environment* env);
 NODE_EXTERN struct uv_loop_s* GetCurrentEventLoop(v8::Isolate* isolate);
 
 /* Converts a unixtime to V8 Date */
-#define NODE_UNIXTIME_V8(t) v8::Date::New(v8::Isolate::GetCurrent(),          \
-    1000 * static_cast<double>(t))
-#define NODE_V8_UNIXTIME(v) (static_cast<double>((v)->NumberValue())/1000.0);
+NODE_DEPRECATED("Use v8::Date::New() directly",
+                inline v8::Local<v8::Value> NODE_UNIXTIME_V8(double time) {
+  return v8::Date::New(v8::Isolate::GetCurrent(), 1000 * time);
+})
+#define NODE_UNIXTIME_V8 node::NODE_UNIXTIME_V8
+NODE_DEPRECATED("Use v8::Date::ValueOf() directly",
+                inline double NODE_V8_UNIXTIME(v8::Local<v8::Date> date) {
+  return date->ValueOf() / 1000;
+})
+#define NODE_V8_UNIXTIME node::NODE_V8_UNIXTIME
 
 #define NODE_DEFINE_CONSTANT(target, constant)                                \
   do {                                                                        \