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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
//
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// Timezone_VXX.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Timezone_VX.cpp#1 $
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//
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// Library: Foundation
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// Package: DateTime
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// Module: Timezone
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//
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// Copyright (c) 2004-2011, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/Timezone.h"
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#include "Poco/Exception.h"
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#include "Poco/Environment.h"
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#include <ctime>
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namespace Poco {
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int Timezone::utcOffset()
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{
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std::time_t now = std::time(NULL);
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struct std::tm t;
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gmtime_r(&now, &t);
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std::time_t utc = std::mktime(&t);
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return now - utc;
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}
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int Timezone::dst()
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{
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std::time_t now = std::time(NULL);
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struct std::tm t;
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if (localtime_r(&now, &t) != OK)
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throw Poco::SystemException("cannot get local time DST offset");
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return t.tm_isdst == 1 ? 3600 : 0;
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}
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bool Timezone::isDst(const Timestamp& timestamp)
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{
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std::time_t time = timestamp.epochTime();
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struct std::tm* tms = std::localtime(&time);
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if (!tms) throw Poco::SystemException("cannot get local time DST flag");
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return tms->tm_isdst > 0;
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}
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std::string Timezone::name()
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{
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// format of TIMEZONE environment variable:
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// name_of_zone:<(unused)>:time_in_minutes_from_UTC:daylight_start:daylight_end
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std::string tz = Environment::get("TIMEZONE", "UTC");
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std::string::size_type pos = tz.find(':');
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if (pos != std::string::npos)
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return tz.substr(0, pos);
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else
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return tz;
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}
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std::string Timezone::standardName()
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{
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return name();
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}
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std::string Timezone::dstName()
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{
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return name();
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}
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} // namespace Poco
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