id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
12963,boost::time_period::span() returns invalid period if one of the periods is not-a-date-time,willi.burkhardt@…,az_sw_dude,"In some cases, the time_period::span() function returns a less than optimal result.
The expected behavior is that if one of the two periods is invalid/not-a-date-time the other is returned.

What I observed is that if one of the two source periods is not-a-date-time, the length() of the period returned is wrong/broken; invalidating the resulting time_period.

I might be wrong with my expectation above, but in this case it should be at least documented. Attached is a global function that I use to ""fix"" it in my code.",Bugs,new,To Be Determined,date_time,Boost 1.62.0,Problem,,time_period span,