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79 lines
1.4 KiB
C++
79 lines
1.4 KiB
C++
//
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// Timezone_VXX.cpp
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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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// SPDX-License-Identifier: BSL-1.0
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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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