From 7e63b2d3ffadbcf33e9e0b823186969c175f9005 Mon Sep 17 00:00:00 2001
From: Hokwon Song <hokwon.song@samsung.com>
Date: Wed, 28 Aug 2013 10:56:48 +0900
Subject: [PATCH] Update historical dst offset for timezone.

Change-Id: Ib60e43ae6272e6bdad589413112f3ee180bb28c1
Signed-off-by: Hokwon Song <hokwon.song@samsung.com>
---
 src/locales/FLcl_TimeZoneImpl.cpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/locales/FLcl_TimeZoneImpl.cpp b/src/locales/FLcl_TimeZoneImpl.cpp
index e4b3c45..915e23a 100644
--- a/src/locales/FLcl_TimeZoneImpl.cpp
+++ b/src/locales/FLcl_TimeZoneImpl.cpp
@@ -23,6 +23,8 @@
 #include <unicode/timezone.h>
 #include <unicode/basictz.h>
 #include <unicode/simpletz.h>
+#include <unicode/tztrans.h>
+#include <unicode/tzrule.h>
 
 #include <FBaseInteger.h>
 #include <FBaseSysLog.h>
@@ -142,6 +144,29 @@ _TimeZoneImpl::_TimeZoneImpl(U_ICU_NAMESPACE::TimeZone* pIcuTimeZone, UDate icuD
 				__dstSaving = pIcuTz->getDSTSavings() / ONE_MIN_IN_MILLISEC;
 			}
 		}
+		else
+		{
+			U_ICU_NAMESPACE::TimeZoneTransition transition;
+			bool result = pIcuTz->getPreviousTransition(icuDate, true, transition);
+			if (result)
+			{
+				const U_ICU_NAMESPACE::TimeZoneRule* pTzFromRule = transition.getFrom();
+				const U_ICU_NAMESPACE::TimeZoneRule* pTzToRule = transition.getTo();
+
+				if (pTzFromRule->getDSTSavings())
+				{
+					__dstSaving = pTzFromRule->getDSTSavings() / ONE_MIN_IN_MILLISEC;
+				}
+				else if (pTzToRule->getDSTSavings())
+				{
+					__dstSaving = pTzToRule->getDSTSavings() / ONE_MIN_IN_MILLISEC;
+				}
+				else //if (pTzFromRule->getDSTSavings() == 0 && pTzToRule->getDSTSavings() == 0)
+				{
+					__dstSaving = 0;
+				}
+			}
+		}
 		delete pInitial;
 		delete pStd;
 		delete pDst;
-- 
2.7.4