id summary reporter owner description type status milestone component version severity resolution keywords cc 3308 gregorian does not use 32 bit int on 64 bit system Andre Vehreschild az_sw_dude "The gregorian date datatype is supposed to use a 32-bit integer for storing the date information. At least this is said so in the documentation. Unfortunately the implementation uses ""unsigned long"" which results in a 64-bit value on 64-bit systems. I am able to propose attached patch. Please comment and correct!" Bugs closed Boost 1.40.0 date_time Boost 1.39.0 Showstopper fixed date_time gregorian date 64bit-issue