如何在c++中从字符串解析日期/时间

How to parse date/time from a string in C++

本文关键字：日期 时间 字符串 c++      更新时间：2023-10-16

如何将字符串与模板"%d.%m.%Y %H:%M:%S"(例如，28.05.2013 17:42:00)转换为boost::posix_time::ptime或类似的东西?

下面是我的非工作代码。

boost::posix_time::ptime stringToDateTime(const std::string &text) {
  const std::locale fct
  (   std::locale::classic()
  ,   new boost::gregorian::date_input_facet("%d.%m.%Y %H:%M:%S")
  );
  std::istringstream is(text);
  is.imbue(fct);
  boost::posix_time::ptime date;
  is >> date;
  return date;
}

有一种难看的方式我不接受

boost::posix_time::ptime stringToDateTime(const std::string &text) {
  return boost::posix_time::time_from_string
  (   text.substr(6, 4) // year
  +   "-"
  +   text.substr(3, 2) // month
  +   "-"
  +   text.substr(0, 2) // day
  +   text.substr(10, 9) // hour,min,sec
  );
}

boost::posix_time::ptime stringToDateTime(const std::string &text) {
  const std::locale fct
  (   std::locale::classic()
  ,   new boost::posix_time::time_input_facet("%d.%m.%Y %H:%M:%S")
  );           //^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - that was an error
  std::istringstream is(text);
  is.imbue(fct);
  boost::posix_time::ptime date;
  is >> date;
  return date;
}
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