Convert internal time format to Windows 1601 epoch on Linux & Mac....

base/time.h

 // Copyright (c) 2006-2008 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.
 
 // Time represents an absolute point in time, internally represented as
 // microseconds (s/1,000,000) since a platform-dependent epoch.  Each
 // platform's epoch, along with other system-dependent clock interface
 // routines, is defined in time_PLATFORM.cc.
 //
 // TimeDelta represents a duration of time, internally represented in
@@ skipping 160 matching lines @@
   static const int64 kMicrosecondsPerSecond = kMicrosecondsPerMillisecond *
                                               kMillisecondsPerSecond;
   static const int64 kMicrosecondsPerMinute = kMicrosecondsPerSecond * 60;
   static const int64 kMicrosecondsPerHour = kMicrosecondsPerMinute * 60;
   static const int64 kMicrosecondsPerDay = kMicrosecondsPerHour * 24;
   static const int64 kMicrosecondsPerWeek = kMicrosecondsPerDay * 7;
   static const int64 kNanosecondsPerMicrosecond = 1000;
   static const int64 kNanosecondsPerSecond = kNanosecondsPerMicrosecond *
                                              kMicrosecondsPerSecond;
 
+#if !defined(OS_WIN)
+  // On Mac & Linux, this value is the delta from the Windows epoch of 1601 to
+  // the Posix delta of 1970. This is used for migrating between the old
+  // 1970-based epochs to the new 1601-based ones. It should be removed from
+  // this global header and put in the platform-specific ones when we remove the
+  // migration code.
+  static const int64 kWindowsEpochDeltaMicroseconds;
+#endif
+
   // Represents an exploded time that can be formatted nicely. This is kind of
   // like the Win32 SYSTEMTIME structure or the Unix "struct tm" with a few
   // additions and changes to prevent errors.
   struct Exploded {
     int year;          // Four digit year "2007"
     int month;         // 1-based month (values 1 = January, etc.)
     int day_of_week;   // 0-based day of week (0 = Sunday, etc.)
     int day_of_month;  // 1-based day of month (1-31)
     int hour;          // Hour within the current day (0-23)
     int minute;        // Minute within the current hour (0-59)
@@ skipping 291 matching lines @@
 #endif
 };
 
 inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
 }  // namespace base
 
 #endif  // BASE_TIME_H_