C++ 将日期时间字符串干净地转换为纪元

发布于 2024-07-20 16:11:22 字数 104 浏览 5 评论 0原文

是否有 C/C++/STL/Boost clean 方法将日期时间字符串转换为纪元时间（以秒为单位）？

yyyy:mm:dd hh:mm:ss

原文

Is there a C/C++/STL/Boost clean method to convert a date time string to epoch time (in seconds)?

yyyy:mm:dd hh:mm:ss

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无人接听 2024-07-27 16:11:22

请参阅：日期/时间转换：字符串表示形式到 time_t

以及：< a href="http://archives.free.net.ph/message/20060504.123105.73e1c873.en.html#boost-users" rel="nofollow noreferrer">[Boost-users] [date_time] 那么为什么没有不是 to_time_t 辅助函数？

所以，显然这样的东西应该可以工作：

#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的建议：使用sscanf将数据解析为struct tm，然后调用mktime。

See: Date/time conversion: string representation to time_t

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

So, apparently something like this should work:

#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();

But I don't think it's much cleaner than Rob's suggestion: use sscanf to parse the data into a struct tm and then call mktime.

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梦忆晨望 2024-07-27 16:11:22

在 Windows 平台上，如果不想使用 Boost，你可以这样做：

// 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;

如果你更喜欢标准库，你可以使用 struct tm 和 mktime() 来完成相同的工作。

On Windows platform you can do something like this if don't want to use Boost:

// 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;

If you prefer standard library, you can use struct tm and mktime() to do the same job.

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