(C++) GetDateIso8601

 

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'; }