闰秒是否存储在Mac上？
闰秒是否存储在Mac上？
提问于 2017-09-24 21:31:03
我在我的系统上运行了find /usr/share/zoneinfo/ -type f -exec file {} \; |grep -v 'no leap'，每个时区文件都说它没有闰秒。在mac上，闰秒是否可以以健壮的方式存储？我正在编写一个库，它需要闰秒，所以我宁愿不通过网络连接，尽管进行某种系统调用是可以接受的。
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-09-24 22:22:54
在macOS: /usr/share/zoneinfo上的IANA数据库中没有任何闰秒信息。
如果您愿意使用第三方C++11库，霍华德·辛纳特时区图书馆将为您提供处理闰秒的全部功能。这确实需要下载IANA数据库。但是您可以将这个库配置为自动下载，也可以手动下载，库将访问该库。
文档中有以下示例：
#include "tz.h"
#include <iostream>
int
main()
{
using namespace date;
using namespace std::chrono_literals;
auto start = to_utc_time(sys_days{2015_y/jul/1} - 500ms);
auto end = start + 2s;
for (auto utc = start; utc < end; utc += 100ms)
{
auto sys = to_sys_time(utc);
auto tai = to_tai_time(utc);
auto gps = to_gps_time(utc);
std::cout << format("%F %T SYS == ", sys)
<< format("%F %T %Z == ", utc)
<< format("%F %T %Z == ", tai)
<< format("%F %T %Z\n", gps);
}
}此示例迭代2015年6月闰秒插入附近的时间，比较系统时间、UTC、TAI和GPS时钟标准：
2015-06-30 23:59:59.500 SYS == 2015-06-30 23:59:59.500 UTC == 2015-07-01 00:00:34.500 TAI == 2015-07-01 00:00:15.500 GPS
2015-06-30 23:59:59.600 SYS == 2015-06-30 23:59:59.600 UTC == 2015-07-01 00:00:34.600 TAI == 2015-07-01 00:00:15.600 GPS
2015-06-30 23:59:59.700 SYS == 2015-06-30 23:59:59.700 UTC == 2015-07-01 00:00:34.700 TAI == 2015-07-01 00:00:15.700 GPS
2015-06-30 23:59:59.800 SYS == 2015-06-30 23:59:59.800 UTC == 2015-07-01 00:00:34.800 TAI == 2015-07-01 00:00:15.800 GPS
2015-06-30 23:59:59.900 SYS == 2015-06-30 23:59:59.900 UTC == 2015-07-01 00:00:34.900 TAI == 2015-07-01 00:00:15.900 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.000 UTC == 2015-07-01 00:00:35.000 TAI == 2015-07-01 00:00:16.000 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.100 UTC == 2015-07-01 00:00:35.100 TAI == 2015-07-01 00:00:16.100 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.200 UTC == 2015-07-01 00:00:35.200 TAI == 2015-07-01 00:00:16.200 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.300 UTC == 2015-07-01 00:00:35.300 TAI == 2015-07-01 00:00:16.300 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.400 UTC == 2015-07-01 00:00:35.400 TAI == 2015-07-01 00:00:16.400 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.500 UTC == 2015-07-01 00:00:35.500 TAI == 2015-07-01 00:00:16.500 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.600 UTC == 2015-07-01 00:00:35.600 TAI == 2015-07-01 00:00:16.600 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.700 UTC == 2015-07-01 00:00:35.700 TAI == 2015-07-01 00:00:16.700 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.800 UTC == 2015-07-01 00:00:35.800 TAI == 2015-07-01 00:00:16.800 GPS
2015-06-30 23:59:59.999 SYS == 2015-06-30 23:59:60.900 UTC == 2015-07-01 00:00:35.900 TAI == 2015-07-01 00:00:16.900 GPS
2015-07-01 00:00:00.000 SYS == 2015-07-01 00:00:00.000 UTC == 2015-07-01 00:00:36.000 TAI == 2015-07-01 00:00:17.000 GPS
2015-07-01 00:00:00.100 SYS == 2015-07-01 00:00:00.100 UTC == 2015-07-01 00:00:36.100 TAI == 2015-07-01 00:00:17.100 GPS
2015-07-01 00:00:00.200 SYS == 2015-07-01 00:00:00.200 UTC == 2015-07-01 00:00:36.200 TAI == 2015-07-01 00:00:17.200 GPS
2015-07-01 00:00:00.300 SYS == 2015-07-01 00:00:00.300 UTC == 2015-07-01 00:00:36.300 TAI == 2015-07-01 00:00:17.300 GPS
2015-07-01 00:00:00.400 SYS == 2015-07-01 00:00:00.400 UTC == 2015-07-01 00:00:36.400 TAI == 2015-07-01 00:00:17.400 GPS页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/46395075
复制相关文章
相似问题
腾讯云开发者
