Revert "http: remove dead code from internal/http.js"

This reverts commit 9156f43.

PR-URL: #36890
Refs: #32329
Reviewed-By: Danielle Adams <adamzdanielle@gmail.com>

lib/internal/http.js

@@ -11,20 +11,28 @@ const {
 const { setUnrefTimeout } = require('internal/timers');
 const { PerformanceEntry, notify } = internalBinding('performance');
 
+let nowCache;
 let utcCache;
 
+function nowDate() {
+  if (!nowCache) cache();
+  return nowCache;
+}
+
 function utcDate() {
   if (!utcCache) cache();
   return utcCache;
 }
 
 function cache() {
   const d = new Date();
-  utcCache = d.toUTCString();
-  setUnrefTimeout(resetCache, 1000 - d.getMilliseconds());
+  nowCache = DatePrototypeValueOf(d);
+  utcCache = DatePrototypeToUTCString(d);
+  setUnrefTimeout(resetCache, 1000 - DatePrototypeGetMilliseconds(d));
 }
 
 function resetCache() {
+  nowCache = undefined;
   utcCache = undefined;
 }
 
@@ -47,6 +55,7 @@ function emitStatistics(statistics) {
 module.exports = {
   kOutHeaders: Symbol('kOutHeaders'),
   kNeedDrain: Symbol('kNeedDrain'),
+  nowDate,
   utcDate,
   emitStatistics
 };