[runtime] Migrate several Date builtins to C++.

src/date.cc

 // Copyright 2012 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.
 
 #include "src/date.h"
 
 #include "src/objects.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
@@ skipping 157 matching lines @@
                       year1 / 400 -
                       base_day;
 
   if ((year % 4 != 0) || (year % 100 == 0 && year % 400 != 0)) {
     return day_from_year + day_from_month[month];
   }
   return day_from_year + day_from_month_leap[month];
 }
 
 
+void DateCache::BreakDownTime(int64_t time_ms, int* year, int* month, int* day,
+                              int* weekday, int* hour, int* min, int* sec,
+                              int* ms) {
+  int const days = DaysFromTime(time_ms);
+  int const time_in_day_ms = TimeInDay(time_ms, days);
+  YearMonthDayFromDays(days, year, month, day);
+  *weekday = Weekday(days);
+  *hour = time_in_day_ms / (60 * 60 * 1000);
+  *min = (time_in_day_ms / (60 * 1000)) % 60;
+  *sec = (time_in_day_ms / 1000) % 60;
+  *ms = time_in_day_ms % 1000;
+}
+
+
 void DateCache::ExtendTheAfterSegment(int time_sec, int offset_ms) {
   if (after_->offset_ms == offset_ms &&
       after_->start_sec <= time_sec + kDefaultDSTDeltaInSec &&
       time_sec <= after_->end_sec) {
     // Extend the after_ segment.
     after_->start_sec = time_sec;
   } else {
     // The after_ segment is either invalid or starts too late.
     if (after_->start_sec <= after_->end_sec) {
       // If the after_ segment is valid, replace it with a new segment.
@@ skipping 164 matching lines @@
     if (result == NULL || result->last_used > dst_[i].last_used) {
       result = &dst_[i];
     }
   }
   ClearSegment(result);
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8