Hello folks, Today I downloaded the new version of Boost, 1.38, and tried to compile and run the Source listing for Timer.5<http://www.boost.org/doc/libs/1_38_0/doc/html/boost_asio/tutorial/tuttimer5/src.html>example from Asio, but it was throwing the exception: "could not convert calendar time to UTC time" (Note that i'm building it under windows vista using MinGW GCC, which I believe is not on the "tested compilers list of boost 1.38") After some time traking the culprit, I got to the function time_type microsec_clock::create_time(time_converter converter) from the boost\date_time\microsec_time_clock.hpp header in which the variable 'std::time_t t' was strangely assuming a negative value, probably due to an overflow. Then I realized that changing the type of the variable 'micros' from uint64_t to std::time_t on that same function, could solve the problem. I just want to know if that's a known issue and if applying that small fix other issues may appear. Thanks in advance Bruno