GetFileDate gets time +1 sometime, bug or feature?

[sartic]

I am getting this usually on usb disks or net mapped disks.

[Michael Vogel]

Windows feature, alternative file commander filter these things when comparing file dates etc.

[Little John]

Your problem might be due to switching between normal time and daylight saving time.

This issue is known for NTFS (not for FAT file systems). On NTFS, the time stamp of a file that was created in summer while there was daylight saving time, is 1 hour wrong during winter -- and vice versa. Just copy a file after creation on NTFS in summer to another drive which has a FAT file system ... and compare their time stamps in winter.

Regards, Little John

[Michael Vogel]

Your problem might be due to switching between normal time and daylight saving time.

This issue is known for NTFS (not for FAT file systems). On NTFS, the time stamp of a file that was created in summer while there was daylight saving time, is 1 hour wrong during winter -- and vice versa. Just copy a file after creation on NTFS in summer to another drive which has a FAT file system ... and compare their time stamps in winter.

Regards, Little John

Time+1 means the delta of a second or not?

[Little John]

Time+1 means the delta of a second or not?

Oops ... good question.
I don't know why I assumed that he means a difference of 1 hour.

Regards, Little John

[gnozal]

USB drives are usually formatted in FAT16 or FAT32.

File time stamps on FAT drives are rounded to the nearest two seconds (even number). The file time stamps on NTFS drives are rounded to the nearest 100 nanoseconds.

Consequently, file time stamps on FAT drives always end with an even number of seconds, while file time stamps on NTFS drives can end with either even or odd number of seconds : this may explain the 1 second difference.