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//
// Timezone_VXX.cpp
//
// Library: Foundation
// Package: DateTime
// Module: Timezone
//
// Copyright (c) 2004-2011, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Timezone.h"
#include "Poco/Exception.h"
#include "Poco/Environment.h"
#include <ctime>
namespace Poco {
int Timezone::utcOffset()
{
std::time_t now = std::time(NULL);
struct std::tm t;
gmtime_r(&now, &t);
std::time_t utc = std::mktime(&t);
return now - utc;
}
int Timezone::dst()
{
std::time_t now = std::time(NULL);
struct std::tm t;
if (localtime_r(&now, &t) != OK)
throw Poco::SystemException("cannot get local time DST offset");
return t.tm_isdst == 1 ? 3600 : 0;
}
bool Timezone::isDst(const Timestamp& timestamp)
{
std::time_t time = timestamp.epochTime();
struct std::tm* tms = std::localtime(&time);
if (!tms) throw Poco::SystemException("cannot get local time DST flag");
return tms->tm_isdst > 0;
}
std::string Timezone::name()
{
// format of TIMEZONE environment variable:
// name_of_zone:<(unused)>:time_in_minutes_from_UTC:daylight_start:daylight_end
std::string tz = Environment::get("TIMEZONE", "UTC");
std::string::size_type pos = tz.find(':');
if (pos != std::string::npos)
return tz.substr(0, pos);
else
return tz;
}
std::string Timezone::standardName()
{
return name();
}
std::string Timezone::dstName()
{
return name();
}
} // namespace Poco
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