# Re: File.mtime: Bug on Windows? **URL:** \ **Category:** Ruby\ **Created:** [March 31, 2006, 6:16pm UTC](https://www.ruby-forum.com/t/re-file-mtime-bug-on-windows/93363 "2006-03-31T18:16:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\ **Post date:** [March 31, 2006, 6:16pm UTC](https://www.ruby-forum.com/t/re-file-mtime-bug-on-windows/93363/1 "2006-03-31T18:16:39Z")
> I think, there is a bug in File.mtime, unfortunately: > > Using: > ruby 1.8.4 (2005-12-24) [i386-mswin32] > Windows XP with NTFS filesystem > > When reading File.mtime( ‘any existing filename’), > the result is different by one hour, when doing this with the > computer clock set to a daylight saving time (DST) and doing this > with the computer clock set to a standard time. The bug, if you are correct, is in the Windows’ implementation of \_stat (or \_stat64). I think your best bet is, perhaps using the Perl module as a baseline, to submit a patch to win32.c to ruby-core, keeping in mind that future versions of Windows just might fix this bug. Regards, Dan ---
**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\ **Post date:** [April 2, 2006, 7:10pm UTC](https://www.ruby-forum.com/t/re-file-mtime-bug-on-windows/93363/2 "2006-04-02T19:10:58Z")
Hello Dan, > I think your best bet is, perhaps using the Perl module as a > baseline, to submit a patch to win32.c to ruby-core, I think, you are right. Sorry to say, that I don’t know programming perl nor any kind of c. So I think, I’ll not succeed in doing this. (Most of Ruby-programming I do at home, just for fun. Only occasionally, I use Ruby in my office for making my job somewhat easier… .) Regards, Axel