rstudio/src/cpp/core/DateTime.cpp at master · pearsonca/rstudio · GitHub

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* DateTime.cpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include <core/DateTime.hpp>

#include "boost/date_time/c_local_time_adjustor.hpp"

#include <boost/date_time/local_time/local_time.hpp>

namespace rstudio {

namespace core {

namespace date_time {

double secondsSinceEpoch()

{

return millisecondsSinceEpoch() / 1000;

}

double secondsSinceEpoch(const boost::posix_time::ptime& time)

{

return millisecondsSinceEpoch(time) / 1000;

}

double secondsSinceEpoch(std::time_t time)

{

return millisecondsSinceEpoch(time) / 1000;

}

double millisecondsSinceEpoch()

{

return millisecondsSinceEpoch(

boost::posix_time::microsec_clock::universal_time());

}

double millisecondsSinceEpoch(const boost::posix_time::ptime& time)

{

using namespace boost::gregorian;

using namespace boost::posix_time;

ptime time_t_epoch(date(1970,1,1));

time_duration diff = time - time_t_epoch;

return static_cast<double>(diff.total_milliseconds());

}

double millisecondsSinceEpoch(std::time_t time)

{

return std::difftime(time, 0) * 1000;

}

boost::posix_time::ptime timeFromSecondsSinceEpoch(double sec)

{

using namespace boost::gregorian;

using namespace boost::posix_time;

ptime time_t_epoch(date(1970,1,1));

return time_t_epoch + seconds(static_cast<long>(sec));

}

boost::posix_time::ptime timeFromMillisecondsSinceEpoch(int64_t ms)

{

using namespace boost::gregorian;

using namespace boost::posix_time;

ptime time_t_epoch(date(1970,1,1));

return time_t_epoch + milliseconds(ms);

}

std::string millisecondsSinceEpochAsString(double ms)

{

boost::posix_time::ptime time =

date_time::timeFromMillisecondsSinceEpoch(static_cast<int64_t>(ms));

return date_time::format(time, "%d %b %Y %H:%M:%S");

}

bool parseUtcTimeFromIsoString(const std::string& timeStr,

boost::posix_time::ptime *pOutTime)

{

return parseUtcTimeFromFormatString(timeStr,

"%Y-%m-%d %H:%M:%S %ZP",

pOutTime);

}

const std::string kIso8601Format {"%Y-%m-%dT%H:%M:%S%FZ"};

bool parseUtcTimeFromIso8601String(const std::string& timeStr,

boost::posix_time::ptime *pOutTime)

{

return parseUtcTimeFromFormatString(timeStr, kIso8601Format, pOutTime);

}

bool parseUtcTimeFromFormatString(const std::string& timeStr,

const std::string& formatStr,

boost::posix_time::ptime *pOutTime)

{

using namespace boost::local_time;

std::stringstream ss(timeStr);

local_time_input_facet* ifc = new local_time_input_facet(formatStr);

ss.imbue(std::locale(ss.getloc(), ifc));

local_date_time ldt(not_a_date_time);

if (ss >> ldt)

{

*pOutTime = ldt.utc_time();

return true;

}

return false;

}

boost::posix_time::time_duration getUtcOffset()

{

using namespace boost::posix_time;

typedef boost::date_time::c_local_adjustor<ptime> local_adj;

const ptime utc_now = second_clock::universal_time();

const ptime now = local_adj::utc_to_local(utc_now);

return now - utc_now;

}

std::string getUtcOffsetString()

{

using namespace boost::posix_time;

std::stringstream out;

time_facet* tf = new time_facet();

tf->time_duration_format("%+%H:%M");

out.imbue(std::locale(out.getloc(), tf));

out << getUtcOffset();

return out.str();

}

} // namespace date_time

} // namespace core

} // namespace rstudio

rstudio/src/cpp/core/DateTime.cpp at master · pearsonca/rstudio · GitHub

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