SkTime: return timezone information

src/ports/SkTime_win.cpp

 
 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkTime.h"
 
 void SkTime::GetDateTime(DateTime* dt)
 {
     if (dt)
     {
         SYSTEMTIME      st;
-        GetSystemTime(&st);
-
+        TIME_ZONE_INFORMATION timeZoneInfo;
+        int tz_bias;
+        GetLocalTime(&st);
+        // https://gist.github.com/wrl/8924636
+        switch (GetTimeZoneInformation(&timeZoneInfo)) {
+            case TIME_ZONE_ID_STANDARD:
+                tz_bias = -timeZoneInfo.Bias - timeZoneInfo.StandardBias;
+                break;
+            case TIME_ZONE_ID_DAYLIGHT:
+                tz_bias = -timeZoneInfo.Bias - timeZoneInfo.DaylightBias;
+                break;
+            default:
+                tz_bias = -timeZoneInfo.Bias;
+                break;
+        }
+        dt->fTimeZoneMinutes = SkToS16(tz_bias);
         dt->fYear       = st.wYear;
         dt->fMonth      = SkToU8(st.wMonth);
         dt->fDayOfWeek  = SkToU8(st.wDayOfWeek);
         dt->fDay        = SkToU8(st.wDay);
         dt->fHour       = SkToU8(st.wHour);
         dt->fMinute     = SkToU8(st.wMinute);
         dt->fSecond     = SkToU8(st.wSecond);
     }
 }
 
 SkMSec SkTime::GetMSecs()
 {
     FILETIME        ft;
     LARGE_INTEGER   li;
     GetSystemTimeAsFileTime(&ft);
     li.LowPart  = ft.dwLowDateTime;
     li.HighPart = ft.dwHighDateTime;
     __int64 t  = li.QuadPart;       /* In 100-nanosecond intervals */
     return (SkMSec)(t / 10000);               /* In milliseconds */
 }