boost 时间
利用boost来获取当前时间又方便快捷，还不用考虑跨平台的问题。
1. 输出YYYYMMDD
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#include <boost/date_time/gregorian/gregorian.hpp>
#define BOOST_DATE_TIME_SOURCE
std::string strTime = boost::gregorian::to_iso_string(\
boost::gregorian::day_clock::local_day());
std::cout << strTime.c_str() << std::endl;
- 2. 输出YYYYMMDD-HH:MM:SS
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#include <boost/date_time/posix_time/posix_time.hpp>
#define BOOST_DATE_TIME_SOURCE
std::string strTime = boost::posix_time::to_iso_string(\
boost::posix_time::second_clock::local_time());
// 这时候strTime里存放时间的格式是YYYYMMDDTHHMMSS，日期和时间用大写字母T隔开了
int pos = strTime.find('T');
strTime.replace(pos,1,std::string("-"));
strTime.replace(pos + 3,0,std::string(":"));
strTime.replace(pos + 6,0,std::string(":"));
std::cout << strTime.c_str() << std::endl;
3. 计算时间间隔。boost里计算时间间隔的功能很多很强大，我列举的仅仅是我目前用到的。
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#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/thread.hpp>
#define BOOST_DATE_TIME_SOURCE
boost::posix_time::ptime time_now,time_now1;
boost::posix_time::millisec_posix_time_system_config::time_duration_type time_elapse;
// 这里为微秒为单位;这里可以将microsec_clock替换成second_clock以秒为单位;
time_now = boost::posix_time::microsec_clock::universal_time();
// sleep 100毫秒;
boost::this_thread::sleep(boost::posix_time::millisec(100));
time_now1 = boost::posix_time::microsec_clock::universal_time();
time_elapse = time_now1 - time_now;
// 类似GetTickCount，只是这边得到的是2个时间的ticket值的差，以微秒为单位;
int ticks = time_elapse.ticks();
// 得到两个时间间隔的秒数;
int sec = time_elapse.total_seconds();
