64位Unix时间戳转换
对于32位系统，是否有C ++实现的64位Unix时间戳转换?我需要将 struct tm 转换为64位整数，反之亦然，包括leap年，时区和UTC.至少在GNU/Linux和Windows上，还需要它具有可移植性.
Is there any C++ implementation of 64-bit Unix timestamp conversions for 32-bit systems? I need to convert struct tm to 64-bit integer and vice versa, including leap years, time zones, UTC. Also need it portable, at least for GNU/Linux and Windows.
您需要:
typedef long long time64_t;
time64_t mktime64(struct tm *t);
struct tm* localtime64_r(const time64_t* t, struct tm* p);
最初(2011年)，此答案包含指向2038bug.com的链接，可以在其中下载小的 pivotal_gmtime_r 库，其中包含上述功能.那时，该库已从2038bug.com中删除，链接断开并由主持人从答案中删除.似乎现在可以在这里找到 pivotal_gmtime_r 代码:
Originally (in 2011) this answer contained links to 2038bug.com where it was possible to download the small pivotal_gmtime_r library, containing the mentioned functions. The library has been removed from 2038bug.com back then, the links became broken and were removed from the answer by a moderator. Seems like that pivotal_gmtime_r code can now be found here:
https://github.com/franklin373/mortage/tree/master/time_pivotal
此外，我发现了另一个名为 y2038 的较新的库，该库还实现了 mktime64 和 localtime64_r :
Also, I've found another, more recent library, called y2038, that also implements mktime64 and localtime64_r: