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