Windows Dayligthsaving problem

[LarsGP 0]

Hi All

In my system Windows treats file timstamps differently depending on the drive concerned:

On the permanent, built-in drives (here c:\ and d:\), one hour is added to every file timestamp when we pass from winter to summer, but on any USB-drives this does not happen.

Does anybody know if this behavior can be counted on?

Regards Lars

[Uwe Raabe 2057]

It depends on whether the drive is formatted as NTFS or FAT32. See https://docs.microsoft.com/en-us/windows/win32/sysinfo/file-times

[LarsGP 0]

Thank you Uwe, that makes sense.

[LarsGP 0]

Just discovered a new problem: I checked a few files that were present when we went into summer-time (daylight saving time) recently, and they matched the NTFS-FAT32 explanation. (NTSF-files changed timestamp, FAT32-files did not)

I then used Windows to copy a file from a NTSF-disk to a FAT32 disk. The copy ended up having the same time-info as the original, as displayed by windows.

I struggle to write code that compensates for both scenatios, and would appriciate advice.

Lars

[Uwe Raabe 2057]

19 minutes ago, LarsGP said:

I struggle to write code that compensates for both scenatios, and would appriciate advice.

You simply cannot. If that were possible, the NTFS handling wouldn't have to be implemented in the first place.

[Pat Foley 51]

I seen a scheme where the file is name like this to allow futureorders dir  and settledorders dir sorting. 

 

             Purchaseorder.vendor.20220115.xls    

 

Add NTFS partition to flash drive or new drive 

Edited March 28, 2022 by Pat Foley
add format

[Bill Meyer 337]

3 hours ago, LarsGP said:

Just discovered a new problem: I checked a few files that were present when we went into summer-time (daylight saving time) recently, and they matched the NTFS-FAT32 explanation. (NTSF-files changed timestamp, FAT32-files did not)

I then used Windows to copy a file from a NTSF-disk to a FAT32 disk. The copy ended up having the same time-info as the original, as displayed by windows.

I struggle to write code that compensates for both scenatios, and would appriciate advice.

Lars

Not sure whether this helps, but you should familiarize yourself with the behavior in Windows.
https://docs.microsoft.com/en-us/windows/win32/sysinfo/file-times

 

[Lars Fosdal 1792]

I´m still annoyed with the fact that not even a running Delphi is able to appropriately deal with DST changes while running.
"No, all those files didn´t change... the time did."

[Uwe Raabe 2057]

2 hours ago, Lars Fosdal said:

a running Delphi is able to appropriately deal with DST changes while running.

You are working too much...

[Lars Fosdal 1792]

I leave the PC and IDE running 24/7 (unless travelling). 

I do however check in to git before I go have a beer on Friday 🙂