C++将日期时间字符串转换为划时代

见: Date/time conversion: string representation to time_t

还有: [Boost-users] [date_time] So how come there isn't a to_time_t helper func?

所以,很明显像这样的事情应该奏效:

#include <boost/date_time/posix_time/posix_time.hpp>
using namespace boost::posix_time;

std::string ts("2002-01-20 23:59:59");
ptime t(time_from_string(ts));
ptime start(gregorian::date(1970,1,1)); 
time_duration dur = t - start; 
time_t epoch = dur.total_seconds();    

但我不认为它比 Rob's suggestion 使用 sscanf 将数据解析为 struct tm 然后打电话 mktime .

在Windows平台上,如果不想使用Boost,可以这样做:

// parsing string
SYSTEMTIME stime = { 0 };
sscanf(timeString, "%04d:%02d:%02d %02d:%02d:%02d",
       &stime.wYear, &stime.wMonth,  &stime.wDay,
       &stime.wHour, &stime.wMinute, &stime.wSecond);

// converting to utc file time
FILETIME lftime, ftime;
SystemTimeToFileTime(&stime, &lftime);
LocalFileTimeToFileTime(&lftime, &ftime);

// calculating seconds elapsed since 01/01/1601
// you can write similiar code to get time elapsed from other date
ULONGLONG elapsed = *(ULONGLONG*)&ftime / 10000000ull;

如果您喜欢标准库,可以使用struct tm和mktime()来完成相同的工作。

http://www.boost.org/doc/libs/1_39_0/doc/html/date_time.html 应该有技巧。