From: Sylvestre Ledru
Subject: [patch] date: reject invalid -d values
Date: Sun, 4 Jan 2026 18:41:30 +0100
>-d accepts some invalid inputs. For example:
>$ /usr/bin/date -d "("
>Sun Jan 4 00:00:00 CET 2026
>The patch in gnulib rejects it, the other add a test in coreutils
>with the patch:
>$ ./src/date -d '('
>date: invalid date '('
>Note that /usr/bin/date -d "[", ".", "^" already generate an error
>(found with a differential fuzzer)
Perhaps related. I discovered some time back that "date -d -z"
produces a seemingly random (but not flagged as invalid) result. As
do some (but not all) other '-[X]' args.
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