Hi. I just found a problem in date_time library with iso_string formating. I search the mailing list and bugs and found out that the bug is really old and the patches are suggested that solves the problem. Mailing list thread: http://lists.boost.org/Archives/boost/2007/03/117276.php Bug tickets https://svn.boost.org/trac/boost/ticket/1726 and https://svn.boost.org/trac/boost/ticket/1674 . The patches are really simple. Can anyoune tell me when this problem will be solved? For now I have my boost files patched, but it would be better to have it in official distribution. Ludo