Problem that may cause constant rehashing

I'm contributor in EiskaltDC++ project and recently we were porting our project to win32/mingw.
So the problem was that after startup client entirely rehashed the share and every time I clicked
manual refresh. Carefull investigation revealed the fact that
FileFindIter::getLastWriteTime != File::getLastModified for the same file! The problem was situated
in the File::convertTime method. I do not understand how it works in window client maybe due special
defines or compiler switches.
According to article
http://msdn.microsoft.com/en-us/library/ms724284(v=VS.85).aspx
I made a changes in our version and the problem was solved.

So I'm glad to share our experience with the original.