//
// Timezone.h
//
// $Id: //poco/1.4/Foundation/include/Poco/Timezone.h#1 $
//
// Library: Foundation
// Package: DateTime
// Module:  Timezone
//
// Definition of the Timezone class. 
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors. 
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Timezone_INCLUDED
#define Foundation_Timezone_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"


namespace Poco {


class Foundation_API Timezone
	/// This class provides information about the current timezone. 
{
public:
	static int utcOffset();
		/// Returns the offset of local time to UTC, in seconds. 
		///     local time = UTC + utcOffset() + dst(). 
		
	static int dst();
		/// Returns the daylight saving time offset in seconds if
		/// daylight saving time is in use. 
		///     local time = UTC + utcOffset() + dst(). 
	
	static bool isDst(const Timestamp& timestamp);
		/// Returns true if daylight saving time is in effect
		/// for the given time.  Depending on the operating system
		/// platform this might only work reliably for certain
		/// date ranges, as the C library's localtime() function
		/// is used. 
		
	static int tzd();
		/// Returns the time zone differential for the current timezone. 
		/// The timezone differential is computed as utcOffset() + dst()
		/// and is expressed in seconds. 
	
	static std::string name();
		/// Returns the timezone name currently in effect. 
		
	static std::string standardName();
		/// Returns the timezone name if not daylight saving time is in effect. 
		
	static std::string dstName();
		/// Returns the timezone name if daylight saving time is in effect. 
};


} // namespace Poco


#endif // Foundation_Timezone_INCLUDED
