#Utime function c windows#
On FAT volumes, the filesystem used by Windows 95/98/ME, file times are stored in local time and are put through even more contortions by these functions, but actually emerge correctly, so file times are stable across DST seasons on FAT volumes. However, Microsoft's implementation of both of these functions use a variety of Win32 API calls that mangle the numbers in ways that don't quite turn out right when a DST season change is involved. It seems particularly ironic that the problem should afflict the NTFS filesystem because the time_t values used by both stat(2) and utime(2) express UTC-based times, and NTFS stores file times in UTC. The problem with Microsoft's stat(2) and utime(2), and hence Perl's built-in stat(), lstat() and utime() when built with the Microsoft C library, is basically this: file times reported by stat(2) or stored by utime(2) may change by an hour as we move into or out of DST if the computer is set to "Automatically adjust clock for daylight saving changes" (which is the default setting) and the file is stored on an NTFS volume (which is the preferred filesystem used by Windows NT/2000/XP). (Note, however, that it calls the original stat(), not the override provided by this module, so you must use the lstat() override provided by this module if you want "correct" UTC file times from lstat().) This module provides replacements for Perl's built-in stat() and utime() functions which respctively get and set "correct" UTC file times, instead of the erroneous values read and written by Microsoft's implementation of stat(2) and utime(2) which Perl's built-in functions inherit on Win32 when built with the Microsoft C library.įor completeness, a replacement for Perl's built-in lstat() function is also provided, although in practice that is unimplemented on Win32 and just calls stat() anyway. # Or, override built-in stat()/lstat()/utime() within all packages: Use = stat($file) or die "stat() failed: $^E\n" Win32::UTCFileTime - Get/set UTC file times with stat/utime on Win32 SYNOPSIS # Override built-in stat()/lstat()/utime() within current package only:
UTC, time zones, and Windows file times.Digression on systems of measuring time.
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