Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppGetDateIso8601/CppGetDateIso8601.pro


include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



include(../../Libraries/BoostAll.pri) #Or use the code below



SOURCES += main.cpp

./CppGetDateIso8601/main.cpp


#include <cassert>

#include <iostream>

#include <chrono>

#include <sstream>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

//#include <boost/lexical_cast.hpp>

#pragma GCC diagnostic pop





#ifndef _WIN32



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





//Returns date in YYYY-MM-DD format

//From http://www.richelbilderbeek.nl/CppGetDateIso8601.htm

const std::string GetDateIso8601Boost()

{

  const boost::gregorian::date today

    = boost::gregorian::day_clock::local_day();

  const std::string s

    = boost::gregorian::to_iso_extended_string(today);

  assert(s.size()==10);

  assert(s[4]=='-');

  assert(s[7]=='-');

  return s;

}

#endif



//Returns date in YYYY-MM-DD format

//From http://www.richelbilderbeek.nl/CppGetDateIso8601.htm

const std::string GetDateIso8601Stl()

{

  const std::time_t t = std::time(0);

  const std::tm * const now = std::localtime( &t );

  std::string year;

  {

    std::stringstream s;

    s << (now->tm_year + 1900);

    year = s.str();

  }

  assert(year.size() == 4);

  std::string month;

  {

    std::stringstream s;

    s << (now->tm_mon + 1);

    month = s.str();

    if (month.size() == 1) month = std::string("0") + month;

  }

  assert(month.size() == 2);

  std::string day;

  {

    std::stringstream s;

    s << (now->tm_mday);

    day = s.str();

    if (day.size() == 1) day = std::string("0") + month;

  }

  assert(day.size() == 2);

  return year + "-" + month + "-" + day;

}



int main()

{

  #ifndef _WIN32

  assert(GetDateIso8601Boost() == GetDateIso8601Stl());

  #endif

  std::cout << GetDateIso8601Stl() << '\n';

}

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(C++) GetDateIso8601

Technical facts

Qt project file: ./CppGetDateIso8601/CppGetDateIso8601.pro

./CppGetDateIso8601/main.cpp