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//
// Timezone_UNIX.cpp
//
// Library: Foundation
// Package: DateTime
// Module: Timezone
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Timezone.h"
#include "Poco/Exception.h"
#include "Poco/Mutex.h"
#include <ctime>
namespace Poco {
class TZInfo
{
public:
TZInfo()
{
tzset();
}
int timeZone()
{
Poco::FastMutex::ScopedLock lock(_mutex);
#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__) || POCO_OS == POCO_OS_ANDROID // no timezone global var
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;
#elif defined(__CYGWIN__)
tzset();
return -_timezone;
#else
tzset();
return -timezone;
#endif
}
const char* name(bool dst)
{
Poco::FastMutex::ScopedLock lock(_mutex);
tzset();
return tzname[dst ? 1 : 0];
}
private:
Poco::FastMutex _mutex;
};
static TZInfo tzInfo;
int Timezone::utcOffset()
{
return tzInfo.timeZone();
}
int Timezone::dst()
{
std::time_t now = std::time(NULL);
struct std::tm t;
if (!localtime_r(&now, &t))
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()
{
return std::string(tzInfo.name(dst() != 0));
}
std::string Timezone::standardName()
{
return std::string(tzInfo.name(false));
}
std::string Timezone::dstName()
{
return std::string(tzInfo.name(true));
}
} // namespace Poco
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