why DLL file's modified time is earlier than created time

Hello Experts,
I find that some dll file's modified time stamp is earlier than their created time stamp, why? Is it normal or abnormal?
LVL 1
siyuAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jdeclueCommented:
Sometimes the created time stamp gets set when a file is copied, and the modified can show the last time a developer closed the file, etc. depends on how the files were copied, what media etc, whether bits were reset etc.

J
0
jdeclueCommented:
Oh yeah, that can also happen if the time was wrong on a machine when it got the created stamp and then it was modified later, etc...

J
0
siyuAuthor Commented:
So, it has nothing to do with the content of file, right?
0
Cloud Class® Course: Amazon Web Services - Basic

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.

jdeclueCommented:
It should not. If I go into my Winnt\System32 folder, and view both Created and Modified stamps, I find approx 50-60 dll's that have older modified dates than the created dates. These files have a Created date, from when they were installed on my computer. The modified date on these files look like they are from when the file was modified. I do not think that this is unusual.

J
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
siyuAuthor Commented:
jdeclue, thank you very much for anwsering my question, I think you anwser is reasonable and acceptable, I will reward my 125 points to you.

But, just for my curiosity, how did you find out that approx 50-60  dll's that have older modified dates than the created dates on your system?  If I go into my Winnt\System32 folder, I found there are a few thousands dlls, it's too clumsy to check one by one and sum them up, is there any utility to help?
0
jdeclueCommented:
I opened Windows Explorer, browsed to System32 and then in the right hand windows selected Detail view, right click on the column at the top and add Modified and Created. It then listed both dates. I then sorted by Modified and look at the oldest. The majority of them had a modified date older than the created date.

Here is some information on the 3 dates associated with a file. http://www.xxcopy.com/xxcopy15.htm


J
0
siyuAuthor Commented:
Thanks again!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows 2000

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.