Daylight saving time -> all my file dates changed

hi,

I must be doing something wrong, because I can't believe this is normal behavior.
Every time windows changes the time to adjust to daylight saving, all my files change their creation date. By one hour.

The consequence is that all my incremental backups (which consisted, say, of 10-15 MB per day) become all of a sudden full backups (which means gigabytes, and so new CDs and new DVDs).
I thought this was a quirk of Windows98 (the old system I have on my desktop), but it also happens with XP and, last summer, it happened with Vista.

I suppose the problem is related to my multiboot environment: when I boot in my backup os I get a second warning about time change and I have to manually adjust time. But how in the world would the file creation date (and every other file date, for what matters) change?

Any idea of what I am doing wrong and how to avoid this in the future?

Thanks for any hints

 

Ugh, I ran into this when using Robocopy to mirror stuff from an XP box to a Samba share. Since the Vista version of Robocopy actually has a "/dst" switch ("compensate for one-hour DST time differences") to address this specific scenario, I'm gonna guess it's intended behaviour.

I'm not aware of any fixes for this, so you'll probably have to live with it or find a smarter backup app that can ignore exactly-one-hour time differences when checking files' time stamps.

I noticed this (i.e. it trying to copy everything again) doesn't seem happen with my external hard disk formatted with NTFS... probably because it's a Windows file system and writable, so Windows can just merrily shift around the time stamps like on the internal drives.