base::Time should correctly handle -epoch time values from Javascript

base/time/time.cc

 // Copyright (c) 2012 The Chromium 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 "base/time/time.h"
 
 #include <cmath>
 #include <ios>
 #include <limits>
 #include <ostream>
@@ skipping 173 matching lines @@
 
 // static
 Time Time::FromJsTime(double ms_since_epoch) {
   // The epoch is a valid time, so this constructor doesn't interpret
   // 0 as the null time.
   return Time(kTimeTToMicrosecondsOffset) +
          TimeDelta::FromMillisecondsD(ms_since_epoch);
 }
 
 double Time::ToJsTime() const {
-  if (is_null()) {
-    // Preserve 0 so the invalid result doesn't depend on the platform.
-    return 0;
-  }
   if (is_max()) {
     // Preserve max without offset to prevent overflow.
     return std::numeric_limits<double>::infinity();
   }
   return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
           kMicrosecondsPerMillisecond);
 }
 
 Time Time::FromJavaTime(int64_t ms_since_epoch) {
   return base::Time::UnixEpoch() +
@@ skipping 134 matching lines @@
   return is_in_range(month, 1, 12) &&
          is_in_range(day_of_week, 0, 6) &&
          is_in_range(day_of_month, 1, 31) &&
          is_in_range(hour, 0, 23) &&
          is_in_range(minute, 0, 59) &&
          is_in_range(second, 0, 60) &&
          is_in_range(millisecond, 0, 999);
 }
 
 }  // namespace base