What changed the last-modified time stamp of these files?
I have two sets of the same old files, one set copied from the other
on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
know the date/time of the copy because the date/time of the created
folders. The file date/times of all files are all exactly one hour
apart.
The copied files are "later". For example, one original is 1/28/2001
1:25 AM, its copy is 1/28/2001 2:25 AM.
When I copy the "copy" back over the original, it retains its changed
time of 2:25 AM.
When I noticed this it surprised me. Can anyone explain why this
happens?
Here are some specifics:
I copied 1.075 folder containing 15,149 files.
The original files were on a Win98SE PC.
The copying was over an Ethernet cable to a Win XP home PC.
The copies were made during central standard time (March 5). I did not
examine the date/times of the files or the computer settings at that
time.
Current situation 4/27/2007 -- during daylight saving time:
Explorer shows the copies on the XP to be ahead by one hour. The
clocks of both machines say the same time. The Win XP PC clock
properties say explicitly that it is on central daylight time. The
Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
before "automatically adjust for daylight saving changes."
Explorer shows the "copied back" file on the Win98SE to have a time 1
hour later than the original it replaced.
Do operating systems change the last-modified dates of files? What
explains this?
Stan Hilliard
Re: What changed the last-modified time stamp of these files?
"Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote in
message news:c1ek235tjvdj7n83fs1l1oeqid3ng8labf@4ax.com
>> I have two sets of the same old files, one set copied from the other
>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time.
>
> CORRECTION: I meant "prior to the recent change FROM standard time
> that happened on Sunday March 11,2007.."
I don't know Stan... I did read that Win9x systems don't have the bits
necessary to store odd number seconds or was it minutes in the time. I
read this having to do with correcting the new daylight saving time. I
think it was on MS Knowledgebase somewhere.
Say, on another subject. You know there is a patch to fix the daylight
saving time for Windows 9x machines, right? It is at:
Re: What changed the last-modified time stamp of these files?
"Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>I have two sets of the same old files, one set copied from the other
> on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
> know the date/time of the copy because the date/time of the created
> folders. The file date/times of all files are all exactly one hour
> apart.
>
> The copied files are "later". For example, one original is 1/28/2001
> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>
> When I copy the "copy" back over the original, it retains its changed
> time of 2:25 AM.
>
> When I noticed this it surprised me. Can anyone explain why this
> happens?
>
> Here are some specifics:
> I copied 1.075 folder containing 15,149 files.
>
> The original files were on a Win98SE PC.
>
> The copying was over an Ethernet cable to a Win XP home PC.
>
> The copies were made during central standard time (March 5). I did not
> examine the date/times of the files or the computer settings at that
> time.
>
> Current situation 4/27/2007 -- during daylight saving time:
> Explorer shows the copies on the XP to be ahead by one hour. The
> clocks of both machines say the same time. The Win XP PC clock
> properties say explicitly that it is on central daylight time. The
> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
> before "automatically adjust for daylight saving changes."
>
> Explorer shows the "copied back" file on the Win98SE to have a time 1
> hour later than the original it replaced.
>
> Do operating systems change the last-modified dates of files? What
> explains this?
> Stan Hilliard
On an NTFS volume file time stamps are changed with a daylight savings time
change to show the new time. So when they were copied to XP Home, it must
be to an NTFS formatted drive, and the time stamps were changed when the DST
change came. It doesn't happen on a FAT formatted drive.
Re: What changed the last-modified time stamp of these files?
On Sat, 21 Apr 2007 13:03:47 -0700, "Rock" <Rock@nospam.net> wrote:
>"Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>>I have two sets of the same old files, one set copied from the other
>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
>> know the date/time of the copy because the date/time of the created
>> folders. The file date/times of all files are all exactly one hour
>> apart.
>>
>> The copied files are "later". For example, one original is 1/28/2001
>> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>>
>> When I copy the "copy" back over the original, it retains its changed
>> time of 2:25 AM.
>>
>> When I noticed this it surprised me. Can anyone explain why this
>> happens?
>>
>> Here are some specifics:
>> I copied 1.075 folder containing 15,149 files.
>>
>> The original files were on a Win98SE PC.
>>
>> The copying was over an Ethernet cable to a Win XP home PC.
>>
>> The copies were made during central standard time (March 5). I did not
>> examine the date/times of the files or the computer settings at that
>> time.
>>
>> Current situation 4/27/2007 -- during daylight saving time:
>> Explorer shows the copies on the XP to be ahead by one hour. The
>> clocks of both machines say the same time. The Win XP PC clock
>> properties say explicitly that it is on central daylight time. The
>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
>> before "automatically adjust for daylight saving changes."
>>
>> Explorer shows the "copied back" file on the Win98SE to have a time 1
>> hour later than the original it replaced.
>>
>> Do operating systems change the last-modified dates of files? What
>> explains this?
>> Stan Hilliard
>
>On an NTFS volume file time stamps are changed with a daylight savings time
>change to show the new time. So when they were copied to XP Home, it must
>be to an NTFS formatted drive, and the time stamps were changed when the DST
>change came. It doesn't happen on a FAT formatted drive.
>Rock [MS-MVP User/Shell]
That explains it. The originals are in on a FAT32 volume and the
copies on FTFS.
I see that in [clock properties] when I uncheck and check "adjust for
daylight saving", Explorer's file dates change. (NTFS)
Stan Hilliard
Re: What changed the last-modified time stamp of these files?
Stan Hilliard wrote:
> On Sat, 21 Apr 2007 13:03:47 -0700, "Rock" <Rock@nospam.net> wrote:
>
>> "Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>>> I have two sets of the same old files, one set copied from the other
>>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
>>> know the date/time of the copy because the date/time of the created
>>> folders. The file date/times of all files are all exactly one hour
>>> apart.
>>>
>>> The copied files are "later". For example, one original is 1/28/2001
>>> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>>>
>>> When I copy the "copy" back over the original, it retains its changed
>>> time of 2:25 AM.
>>>
>>> When I noticed this it surprised me. Can anyone explain why this
>>> happens?
>>>
>>> Here are some specifics:
>>> I copied 1.075 folder containing 15,149 files.
>>>
>>> The original files were on a Win98SE PC.
>>>
>>> The copying was over an Ethernet cable to a Win XP home PC.
>>>
>>> The copies were made during central standard time (March 5). I did not
>>> examine the date/times of the files or the computer settings at that
>>> time.
>>>
>>> Current situation 4/27/2007 -- during daylight saving time:
>>> Explorer shows the copies on the XP to be ahead by one hour. The
>>> clocks of both machines say the same time. The Win XP PC clock
>>> properties say explicitly that it is on central daylight time. The
>>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
>>> before "automatically adjust for daylight saving changes."
>>>
>>> Explorer shows the "copied back" file on the Win98SE to have a time 1
>>> hour later than the original it replaced.
>>>
>>> Do operating systems change the last-modified dates of files? What
>>> explains this?
>>> Stan Hilliard
>>
>> On an NTFS volume file time stamps are changed with a daylight savings
time
>> change to show the new time.
But why should they be? What kind of "design logic" is that? It
sounds crazy! (although I believe you, I don't understand WHY that would
have been designed into it in the first place; when a file is date/time
stamped, THAT stamp should be in concrete, and not subject to the whims of
DST or no DST)
Re: What changed the last-modified time stamp of these files?
"Bill in Co." <not_really_here@earthlink.net> wrote
> Stan Hilliard wrote:
>> On Sat, 21 Apr 2007 13:03:47 -0700, "Rock" <Rock@nospam.net> wrote:
>>
>>> "Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>>>> I have two sets of the same old files, one set copied from the other
>>>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
>>>> know the date/time of the copy because the date/time of the created
>>>> folders. The file date/times of all files are all exactly one hour
>>>> apart.
>>>>
>>>> The copied files are "later". For example, one original is 1/28/2001
>>>> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>>>>
>>>> When I copy the "copy" back over the original, it retains its changed
>>>> time of 2:25 AM.
>>>>
>>>> When I noticed this it surprised me. Can anyone explain why this
>>>> happens?
>>>>
>>>> Here are some specifics:
>>>> I copied 1.075 folder containing 15,149 files.
>>>>
>>>> The original files were on a Win98SE PC.
>>>>
>>>> The copying was over an Ethernet cable to a Win XP home PC.
>>>>
>>>> The copies were made during central standard time (March 5). I did not
>>>> examine the date/times of the files or the computer settings at that
>>>> time.
>>>>
>>>> Current situation 4/27/2007 -- during daylight saving time:
>>>> Explorer shows the copies on the XP to be ahead by one hour. The
>>>> clocks of both machines say the same time. The Win XP PC clock
>>>> properties say explicitly that it is on central daylight time. The
>>>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
>>>> before "automatically adjust for daylight saving changes."
>>>>
>>>> Explorer shows the "copied back" file on the Win98SE to have a time 1
>>>> hour later than the original it replaced.
>>>>
>>>> Do operating systems change the last-modified dates of files? What
>>>> explains this?
>>>> Stan Hilliard
>>>
>>> On an NTFS volume file time stamps are changed with a daylight savings
> time
>>> change to show the new time.
>
> But why should they be? What kind of "design logic" is that? It
> sounds crazy! (although I believe you, I don't understand WHY that would
> have been designed into it in the first place; when a file is date/time
> stamped, THAT stamp should be in concrete, and not subject to the whims of
> DST or no DST)
Re: What changed the last-modified time stamp of these files?
Rock wrote:
> "Bill in Co." <not_really_here@earthlink.net> wrote
>
>> Stan Hilliard wrote:
>>> On Sat, 21 Apr 2007 13:03:47 -0700, "Rock" <Rock@nospam.net> wrote:
>>>
>>>> "Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>>>>> I have two sets of the same old files, one set copied from the other
>>>>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time. I
>>>>> know the date/time of the copy because the date/time of the created
>>>>> folders. The file date/times of all files are all exactly one hour
>>>>> apart.
>>>>>
>>>>> The copied files are "later". For example, one original is 1/28/2001
>>>>> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>>>>>
>>>>> When I copy the "copy" back over the original, it retains its changed
>>>>> time of 2:25 AM.
>>>>>
>>>>> When I noticed this it surprised me. Can anyone explain why this
>>>>> happens?
>>>>>
>>>>> Here are some specifics:
>>>>> I copied 1.075 folder containing 15,149 files.
>>>>>
>>>>> The original files were on a Win98SE PC.
>>>>>
>>>>> The copying was over an Ethernet cable to a Win XP home PC.
>>>>>
>>>>> The copies were made during central standard time (March 5). I did not
>>>>> examine the date/times of the files or the computer settings at that
>>>>> time.
>>>>>
>>>>> Current situation 4/27/2007 -- during daylight saving time:
>>>>> Explorer shows the copies on the XP to be ahead by one hour. The
>>>>> clocks of both machines say the same time. The Win XP PC clock
>>>>> properties say explicitly that it is on central daylight time. The
>>>>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
>>>>> before "automatically adjust for daylight saving changes."
>>>>>
>>>>> Explorer shows the "copied back" file on the Win98SE to have a time 1
>>>>> hour later than the original it replaced.
>>>>>
>>>>> Do operating systems change the last-modified dates of files? What
>>>>> explains this?
>>>>> Stan Hilliard
>>>>
>>>> On an NTFS volume file time stamps are changed with a daylight savings
time
>>>> change to show the new time.
>>
>> But why should they be? What kind of "design logic" is that? It
>> sounds crazy! (although I believe you, I don't understand WHY that would
>> have been designed into it in the first place; when a file is date/time
>> stamped, THAT stamp should be in concrete, and not subject to the whims
of
>> DST or no DST)
>
>
> Time stamp changes with daylight savings
> http://support.microsoft.com/kb/129574/en-us
>
I wasn't disputing that it did (and I seem to recall this problem too,
between work and home), but was asking WHY it was designed this way, on the
NT systems (as an offset from GMT). In other words, why was NT designed
that way - (so different from the other operating systems, that don't have
this problem)?
Re: What changed the last-modified time stamp of these files?
"Bill in Co." <not_really_here@earthlink.net> wrote
> Rock wrote:
>> "Bill in Co." <not_really_here@earthlink.net> wrote
>>
>>> Stan Hilliard wrote:
>>>> On Sat, 21 Apr 2007 13:03:47 -0700, "Rock" <Rock@nospam.net> wrote:
>>>>
>>>>> "Stan Hilliard" <usenetreplyMS@samplingplansNOTSPAM.com> wrote
>>>>>> I have two sets of the same old files, one set copied from the other
>>>>>> on 3/5/2007 12:53 PM -- prior to the recent change to standard time.
>>>>>> I
>>>>>> know the date/time of the copy because the date/time of the created
>>>>>> folders. The file date/times of all files are all exactly one hour
>>>>>> apart.
>>>>>>
>>>>>> The copied files are "later". For example, one original is 1/28/2001
>>>>>> 1:25 AM, its copy is 1/28/2001 2:25 AM.
>>>>>>
>>>>>> When I copy the "copy" back over the original, it retains its changed
>>>>>> time of 2:25 AM.
>>>>>>
>>>>>> When I noticed this it surprised me. Can anyone explain why this
>>>>>> happens?
>>>>>>
>>>>>> Here are some specifics:
>>>>>> I copied 1.075 folder containing 15,149 files.
>>>>>>
>>>>>> The original files were on a Win98SE PC.
>>>>>>
>>>>>> The copying was over an Ethernet cable to a Win XP home PC.
>>>>>>
>>>>>> The copies were made during central standard time (March 5). I did
>>>>>> not
>>>>>> examine the date/times of the files or the computer settings at that
>>>>>> time.
>>>>>>
>>>>>> Current situation 4/27/2007 -- during daylight saving time:
>>>>>> Explorer shows the copies on the XP to be ahead by one hour. The
>>>>>> clocks of both machines say the same time. The Win XP PC clock
>>>>>> properties say explicitly that it is on central daylight time. The
>>>>>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a
>>>>>> check
>>>>>> before "automatically adjust for daylight saving changes."
>>>>>>
>>>>>> Explorer shows the "copied back" file on the Win98SE to have a time 1
>>>>>> hour later than the original it replaced.
>>>>>>
>>>>>> Do operating systems change the last-modified dates of files? What
>>>>>> explains this?
>>>>>> Stan Hilliard
>>>>>
>>>>> On an NTFS volume file time stamps are changed with a daylight savings
> time
>>>>> change to show the new time.
>>>
>>> But why should they be? What kind of "design logic" is that? It
>>> sounds crazy! (although I believe you, I don't understand WHY that would
>>> have been designed into it in the first place; when a file is date/time
>>> stamped, THAT stamp should be in concrete, and not subject to the whims
> of
>>> DST or no DST)
>>
>>
>> Time stamp changes with daylight savings
>> http://support.microsoft.com/kb/129574/en-us
>>
>
> I wasn't disputing that it did (and I seem to recall this problem too,
> between work and home), but was asking WHY it was designed this way, on
> the
> NT systems (as an offset from GMT). In other words, why was NT
> designed
> that way - (so different from the other operating systems, that don't have
> this problem)?
Re: What changed the last-modified time stamp of these files?
"Bill in Co." wrote in message news:O1E7B$IhHHA.596@TK2MSFTNGP06.phx.gbl...
> Rock wrote:
>> "Bill in Co." wrote
>>> Stan Hilliard wrote:
>>>>>> Current situation 4/27/2007 -- during daylight saving time:
>>>>>> Explorer shows the copies on the XP to be ahead by one hour. The
>>>>>> clocks of both machines say the same time. The Win XP PC clock
>>>>>> properties say explicitly that it is on central daylight time. The
>>>>>> Win98SE PC clock properties say (GMT-06:00) Central Time, with a check
>>>>>> before "automatically adjust for daylight saving changes."
>>>>>>
>>>>> On an NTFS volume file time stamps are changed with a daylight savings time
>>>>> change to show the new time.
>>> But why should they be? What kind of "design logic" is that? It
>>> sounds crazy! (although I believe you, I don't understand WHY that would
>>> have been designed into it in the first place; when a file is date/time
>>> stamped, THAT stamp should be in concrete, and not subject to the whims of
>>> DST or no DST)
> I wasn't disputing that it did (and I seem to recall this problem too,
> between work and home), but was asking WHY it was designed this way, on the
> NT systems (as an offset from GMT). In other words, why was NT designed
> that way - (so different from the other operating systems, that don't have
> this problem)?
Not NT specifically, but NTFS. FATx saves the time according to "clock".
If you really think about it, it makes more sense to stamp a file according to
a "constant" GMT. There is only one point in time that your file was saved,
regardless of your point in space. (or the shifted clock).
What changed the last-modified time stamp of these files? 
Linear Mode
