On a debian stable system: ahiker!1 itz$ cat /etc/timezone America/Los_Angeles ahiker!2 itz$ date Mon Oct 30 23:00:18 PDT 2017 ahiker!3 itz$ date -d 'TZ="Europe/Prague" 2017-10-31 15:45' +'%H%M %m/%d/%Y' 0745 10/31/2017 ahiker!4 itz$ date --version date (GNU coreutils) 8.26 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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. But on a current "stable" gentoo system: matica!17 ~$ cat /etc/timezone America/Los_Angeles matica!18 ~$ date Mon Oct 30 23:02:11 PDT 2017 ## WRONG ! vv matica!19 ~$ date -d 'TZ="Europe/Prague" 2017-10-31 15:45' +'%H%M %m/%d/%Y' 1545 10/31/2017 ## WRONG ! ^^ matica!20 ~$ date --version date (GNU coreutils) 8.26 Packaged by Gentoo (8.26 (p1.1)) Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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. Reproducible: Always
None of the _p1.1 patches appear to touch anything date related, so the problem is not there.
Looking for a workaround, I see that this functions correctly: matica!21 coreutils-8.26$ date -d '2017-10-31 15:45 +0300' +'%H%M %m/%d/%Y' 0545 10/31/2017
This also works: matica!23 coreutils-8.26$ env TZ=Europe/Prague date -d '2017-10-31 15:45' +'%s' 1509461100 matica!27 coreutils-8.26$ date -d '@1509461100' +'%H%M %m/%d/%Y' 0745 10/31/2017
Can you reproduce with sys-apps/coreutils[vanilla]? And please make sure that you are using the same sys-libs/timezone-data version like you are using on your Debian system.
This is https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851934 Upstream patch: http://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=b14be5085cd1aefd473a000456b21270e6070711 Fixed in >=sys-apps/coreutils-8.27.
