Dear Sir,
I have stumbled across this anomaly whilst processing a series of dates. 
I have not found any other legal date combination that generates this 
error. Perl time facilities seem to be affected by this too.

mjh@carnaby:~> date --date="2022/03/27 00:00:00"
Sun 27 Mar 00:00:00 GMT 2022

mjh@carnaby:~> date --date="2022/03/27 01:00:00"
date: invalid date ‘2022/03/27 01:00:00’

mjh@carnaby:~> date --date="2022/03/27 02:00:00"
Sun 27 Mar 02:00:00 BST 2022

The version of date is:
mjh@carnaby:~> date --version
date (GNU coreutils) 8.29
Copyright (C) 2017 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.

The operating system is opensuse leap 15.2:
Linux version 5.3.18-lp152.106-default (geeko@buildhost) (gcc version 
7.5.0 (SUSE Linux)) #1 SMP Mon Nov 22 08:38:17 UTC 2021 (52078fe)

Martin Hughes