How to get the number of days between two dates using boost::date_time

Question

Are there any APIs available in boost::date_time to get the number of days between two dates that is also calendar specific?

Example, Number of days between 2005/01/01 and 2006/12/31 would be 730 in a seven day calendar and would be 504 in a five day calendar.

possible duplicate of [weekdays' duration using boost date](http://stackoverflow.com/questions/7340986/weekdays-duration-using-boost-date) — NathanOliver, May 21 '15 at 19:33

sehe · Accepted Answer · 2015-05-22T13:15:05.490

6

Yup: posix_time to the rescue

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#include <boost/date_time/gregorian/greg_date.hpp>
#include <iostream>

int main() {
    using boost::gregorian::date;

    date a { 2005, 1, 1 }, b { 2006, 12, 31 };

    std::cout << (b-a).days() << "\n";
}

Prints

729 ^[1]

Use posix_time::ptime if you want to use gregorian date + time of day (hh:mm:ss.fffffff). local_time::local_date_time adds timezone awareness for this (to be correct about daylight savings e.g.)

_{Trivia Incidentally this number is also the square of 27, and the cube of 9, and as a consequence of these properties, a perfect totient number, a centered octagonal number, and a Smith number. It is not the sum of four consecutive primes}

edited May 22 '15 at 13:15

answered May 21 '15 at 21:50

sehe

350,152
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The sum of four consecutive prime + another (29) ;-) – Nico May 22 '15 at 13:06
@Nico OMG. I can't even ~~math~~ wikipedia anymore. [Fixed](http://stackoverflow.com/posts/30384988/revisions) – sehe May 22 '15 at 13:15
@sehe Keep math. Adding four odd primes yields an even number, and four consecutive primes including two can only sum up to 17. – Columbo May 22 '15 at 21:15
Like if you vote this answer because of the trivia and not because of the answer itself. – Peregring-lk Sep 13 '18 at 00:00
Retweet if you like the comments. – G B Dec 13 '19 at 09:31

How to get the number of days between two dates using boost::date_time

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