I ran the following expecting it to provide me with the date 35 years ago
date -d "now - 35 years" Instead I received the error: date: invalid date ‘now - 35 years’ Testing it further I found that the break point is at 24 years: $ date --version date (GNU coreutils) 8.32 Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by David MacKenzie. $ date -d "now - 23 years" Tue Apr 28 03:20:37 PM EST 1998 $ date -d "now - 24 years" date: invalid date ‘now - 24 years’ $ I compiled from the latest coreutils source and found it to have the same issue: $ cd coreutils/src/ $ ./date --version date (GNU coreutils) 8.32.143-62a7c Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by David MacKenzie. $ date "now - 23 years" date: invalid date ‘now - 23 years’ $ date -d "now - 23 years" Tue Apr 28 03:21:09 PM EST 1998 $ date -d "now - 24 years" date: invalid date ‘now - 24 years’ $ I found that this did work on a system running coreutils 8.23 so something seems to have broken since then. These are all Linux systems that I've tried this on. The system I tested on was a fresh Ubuntu 21.04 VM. Linux ubuntu2104 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:12:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux Thanks, Mark
