However, coreutils stat uses the statx() system call where available to retrieve the birth time only since version 8.31. (So even when creation time support has been added to a filesystem, some deployed kernels have not immediately supported it, even after adding nominal support for that filesystem version, e.g., XFS v5.)Īs Craig Sanders and Mohsen Pahlevanzadeh pointed out, stat does support the %w and %W format specifiers for displaying the file birth time (in human readable format and in seconds since Epoch respectively) prior to coreutils version 8.31. Linux provides the statx(2) system call interface for retrieving the file birth time for filesystems that support it since kernel version 4.11. Modern Linux filesystems, such as ext4, Btrfs, XFS ( v5 and later) and JFS, do store the file creation time (aka birth time), but use different names for the field in question ( crtime in ext4/XFS, otime in Btrfs and JFS). The POSIX standard only defines three distinct timestamps to be stored for each file: the time of last data access, the time of last data modification, and the time the file status last changed. Note that on Linux this requires coreutils 8.31, glibc 2.28 and kernel version 4.11 or newer. Stat -c '%w' file on filesystems that store creation time.
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