boost 日期时间计算

Posted 2020-07-26 晴天224

示例代码如下：

 1 #include <boost/date_time/gregorian/gregorian.hpp>  
 2 #include <boost/date_time/posix_time/posix_time.hpp>  
 3 using namespace boost::gregorian;
 4 using namespace boost::posix_time;
 5 #include <iostream>  
 6 using namespace std;
 7 #include <string>
 8 
 9 void TimerTest()
10 {
11     {
12         // 例1. 日期计算：打印今天日期；今年感恩节（11月的第4个星期四）的日期；如果还没有到今年感恩节，打印今天到感恩节还有多少天;
13         typedef nth_day_of_the_week_in_month nth_dow;
14         date today = day_clock::local_day(); // today; // 获取今天日期;
15         std::cout << "today is: " << today << std::endl;
16         nth_dow fourth_thur_in_nov(nth_dow::fourth, Thursday, Nov); // 4th thursday in Nov;
17         date thanksgiving = fourth_thur_in_nov.get_date(today.year()); // get the date this year;
18         std::cout << "Thanksgiving day this year is: " << thanksgiving << std::endl;
19         if(today < thanksgiving)
20         {
21             date_duration dd = thanksgiving - today; // date duration; // 时间差;
22             std::cout << "has " << dd.days() << " days to thanksgiving."<< std::endl;
23         }
24     }
25 
26     {
27         // 日期操作;
28         std::cout << std::endl << std::endl;
29         date today = day_clock::local_day();                        // today; // 获取今天日期;
30         std::cout << today.year() << std::endl;                        // 打印年;
31         std::cout << today.month() << std::endl;                    // 打印月;
32         std::cout << today.day() << std::endl;                        // 打印日;
33         std::cout << today.week_number() << std::endl;                // 今年的第几周;
34         std::cout << today.day_of_week() << std::endl;                // 打印星期几;
35         std::cout << today.day_of_year() << std::endl;                // 打印一年中的第几天;
36         std::cout << today.end_of_month() << std::endl;                // 打印本月的最后一天是，闰月的2月，可以试试;
37         std::cout << today.modjulian_day() << std::endl;
38         std::cout << today.julian_day() << std::endl;
39         std::cout << (today.day_of_week() == 0) << std::endl;        // 判断今天是星期日吗，周日为0;
40         std::cout << (today.end_of_month() == today) << std::endl;    // 判断今天是当月的最后一天吗;
41         date dateTemp = from_string("2016-11-26");
42         date_duration dd = dateTemp - today;                        // 时间差;
43         std::cout << "subDate = " << dd.days() << std::endl;        // 相差多少天;
44         // 获取指定（11月的第4个星期四）日期;
45         typedef nth_day_of_the_week_in_month nth_dow;
46         nth_dow fourth_thur_in_nov(nth_dow::fourth, Thursday, Nov);        // 4th thursday in Nov;
47         date thanksgiving = fourth_thur_in_nov.get_date(today.year());    // get the date this year;
48     }
49 
50     {
51         // 时间操作;
52         ptime timeTemp = second_clock::local_time();                    // 获取当前时间，秒级别;
53         std::cout << timeTemp.time_of_day() << std::endl;                // 当前时间;
54         std::cout << timeTemp.date() << std::endl;                        // 当前时间对应的日期;
55         ptime destTime = time_from_string("2016-06-15 17:00:00");
56         time_duration tt = timeTemp - destTime;                            // 时间差;
57         std::cout << "subTime = " << (tt.seconds() >= 0) << std::endl;    // 相差多少秒;
58     }
59 }