Microsoft's Robocopy program has these two options: /FFT :: assume FAT File Times (2-second granularity). /DST :: compensate for one-hour DST time differences. What is the exact algorithm that Robocopy uses for this? If I wanted to implement this in Python for example, how would I do this? I would like to know specifically how Robocopy does it, and I would like to know if there is a more correct way to compare timestamps while allowing for DST and filesystem differences. def compare_file_timestamps_robocopy_style(file1, file2): """Returns True if the file timestamps should be considered equal when adjusted for filesystem granularity and daylight savings time. This uses the same algorithm as Microsoft's Robocopy. """ time1 = os.path.getmtime(file1) time2 = os.path.getmtime(file2) return ??? Continue reading...
