/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include "util.h"

#include <centralrepository.h>

_LIT(KDaylightSavingsMinFormat, "%F%Y0224:");

_LIT(KDaylightSavingsMaxFormat, "%F%Y0924:");

void Util::SetAppropriateTimezoneL()

	{

	TUid repUid = {0x1020e4d3};

	CRepository* rep = CRepository::NewLC(repUid);

	// Set the date format to European

	User::LeaveIfError(rep->StartTransaction(CRepository::EConcurrentReadWriteTransaction));

	User::LeaveIfError(rep->Set(101, EDateEuropean)); // 101 is the date format reg entry

	TUint32 keys(0);

	User::LeaveIfError(rep->CommitTransaction(keys));

	CleanupStack::PopAndDestroy(rep);

	TExtendedLocale locale;

	locale.LoadSystemSettings();

	locale.GetLocale()->SetDateFormat(EDateEuropean);

	User::LeaveIfError(locale.SaveSystemSettings());

	}

TBool Util::DaylightSavingsAppliesL(const TTime& utc)

	{

	// This algorithm needs the first day of the week to be monday

	TDay oldStart;

	TLocale set;

	oldStart = set.StartOfWeek();

	set.SetStartOfWeek(EMonday);

	set.Set();

	TBuf<9> min;

	TBuf<9> max;

	utc.FormatL(min, KDaylightSavingsMinFormat);

	utc.FormatL(max, KDaylightSavingsMaxFormat);

	// Get times representing the first/last possible day of this 

	// year that daylight savings time change could change on

	TTime timeMin;

	User::LeaveIfError(timeMin.Set(min));

	TTime timeMax;

	User::LeaveIfError(timeMax.Set(max));

	// Find the last sunday in the respective months

	TTimeIntervalDays addMin(6 - timeMin.DayNoInWeek());

	TTimeIntervalDays addMax(6 - timeMax.DayNoInWeek());

	timeMin += addMin;

	timeMax += addMax;

	// The change happens at 1AM.

	TTimeIntervalHours hour(1);

	timeMin += hour;

	timeMax += hour;

	// Now we know which day the change occurs on.

	// Compare it to what the UTC is.

	TBool result = ((timeMin <= utc) && (timeMax > utc));

	// reset the first week day

	set.SetStartOfWeek(oldStart);

	set.Set();

	return result;

	}